As a second-language learner of English, there are a lot of interesting words I've come across that have stood out to me. Here's a mini collection of them:

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Abandon (n.) — complete lack of inhibition or restraint (e.g., she sings with total abandon)

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Adultescent (n.) — a young adult or middle-aged person who has interests, traits, etc that are usually associated with teenagers

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Bacchanalia — (n.) a wild gathering involving excessive drinking and promiscuity (named after an ancient Greek/Roman festival)

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Bildungsroman (n.) — a type of novel concerned with the education, development, and maturing of a young protagonist

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Brainchild (n.) — an idea or invention considered to be a particular person's invention (e.g., this statue is the brainchild of the local artist)

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Bromide (n.) — a trite or unoriginal remark, typically to soothe or placate (e.g., "when life gives you lemons, make lemonade")

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Conjecture — (n.) an opinion or conclusion formed on the basis of incomplete information; guess; speculation; belief

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Debauchery — (n.) extreme indulgence in sensual pleasures

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Denouement (n.) — the resolution of a story/play/movie; finale; ending

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Deterrence (n.) — the act of discouraging an action or event through instilling doubt or fear of the consequences

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Diplomacy (n.) — the art of dealing with people in a sensitive and effective way; tact; sensitivity; discretion; subtlety

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Equanimity (n.) — a state of psychological stability and composure which is undisturbed by experience of or exposure to emotions, pain, or other phenomena that may cause others to lose the balance of their mind

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Esemplastic (adj.) — having the ability to shape diverse elements/concepts into a unified whole (e.g., the esemplastic power of a great mind to simplify the difficult)

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​Fester —  (v.) (of a wound or sore) become septic; (of a negative feeling or problem) become worse or more intense, especially through long-term neglect or indifference

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Festooned —  (v.) decorated with festoons (garland of things suspended in a curve between two points)

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Gaucherie (n.) — lack of social grace/sensitivity/acuteness; awkwardness; tactlessness

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Hamartia — (n.) the flaw/error of a tragic hero that leads to his downfall

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Hagiography — (n.) biography that idealizes its subject; the writing of the lives of saints

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Hypocorism (n.) — a pet name; a nickname that shows affection or closeness; the use of forms of speech imitative of baby talk, especially by adults; "play the child" (Greek origin)

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Inculcate (v.) — instill (an attitude, idea, or habit) by persistent instruction; instill in

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Indelible (adj.) — not able to be forgotten or removed (e.g., the movie made an indelible impression on me)

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Inexorable (adj.) — impossible to stop or prevent; relentless; unavoidable

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Inveterate (adj.) — settle or confirmed in a habit, practice, feeling, etc. (e.g., an inveterate gambler)

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Kinkeeping (n.) — the labor involved in maintaining and strengthening family ties (e.g., organizing social occasions, remembering birthdays, sending gifts)

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Lilt (n.) — a characteristic rising and falling of the voice when speaking; a pleasant gentle accent; a pleasant, gently swinging rhythm in a song or tune

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Nixie (n.) — a letter/parcel that is undeliverable because of a faulty or illegible address

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Numinous (adj.) — having a strong religious or spiritual quality; indicating or suggesting the presence of a divinity

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Ostensible (adj.) — outwardly appearing as such; pretended (e.g., an ostensible cheerfulness concealing sadness)

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Paraph (adj.) — a flourish made after a signature, as in a document, originally as a precaution against forgery

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Pernicious (adj.) — having a harmful effect, especially in a gradual or subtle way

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Polymath (n.) — a person with wide-ranging knowledge or learning (e.g., the trivia team had a polymath who knew lots of random facts)

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Sententious — (adj.) abounding in pithy aphorisms or maxims (e.g., a sententious book)

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Sobriquet — (n.) an affectionate or humorous nickname

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Solipsism — (n.) being very self-centered or selfish; the philosophical idea that only the self (i.e., your own mind and experiences) exists

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​Temperance (n.) — abstinence from alcoholic drink; moderation or self restraint, especially in eating and drinking

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​Umbrage (n.) — offense or annoyance (e.g., she took umbrage at his remarks); (archaic) shade or shadow, especially cast by trees

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Wordmonger (n.) — a writer/speaker who uses words pretentiously or with careless disregard for meaning