Gibe- (v.) to utter taunting words; (n.) an expression of scorn
The bully gibed hurtful and derogatory words to the little boy.

Insidious- (adj.) intended to deceive or entrap; sly, treacherous
We believed his motives for lying to his teacher was an insidious plot to get away with cheating.

Adroit- (adj.) skillful, expert in the use of the hands or mind
The artist was adroit at painting masterpieces because, through years of practice, she had become an expert.

Quintessence- (n.) the purest essence or form of something; the most typical example
The valedictorian is the quintessence of acedemics for his or her class.

Craven- (adj.) cowardly; (n.) a coward
Even though he often seems brave, the horror movie brought out his craven side.

Muse- (v.) to think about in a dreamy way, ponder
He was musing on the thought of his dream girl until the teacher called his name.

Urbane- (adj.) refined in manner or style, suave
Unlike his crude brother, he was urbane and polite to us all.

Expunge- (v.) to erase, obliterate, destroy
I used white-out to expunge the error I couldn't erase with my pencil.

Skulk- (v.) to move about stealthily; to lie in hiding
The CIA agent skulked into the room without being detected.

Supercilious- (adj.) proud and contemptuous; showing scorn because of a feeling of superiority
It's inaccurate to say all wealthy people are supercilious because many are humble and servile.

Altruistic- (adj.) unselfish, concerned with the welfare of others
Although many people said she's altruistic, I find her selfish and self-centered.

Truculent- (adj.) fierce and cruel; aggressive; deadly, destructive; scathingly harsh
Initially he struck me as gentle, but his truculent and aggressive behavior has proved otherwise.

Brandish- (v.) to wave or flourish in a menacing or vigorous fashion
He brandished his bat as he approached the plate in preparation for his actual swing.

Extirpate- (v.) to tear up by the roots; to destroy totally
We headed to the garden to extirpate the weeds and were determined to destroy them totally by taking out the roots.

Abhor- (v.) to regard with horror or loathing; to hate deeply
An arachnophobe doesn't just dislike spiders, but rather abhors them.

Vociferous- (adj.) loud and noisy; compelling attention
As soon as their parents left, the quiet and subdued children mutated into vociferous beasts!

Voluminous- (adj.) of great size; numerous; writing or speaking at great length
Voluminous shampoo is used to make your hair plentiful and greater in size.

Animosity- (n.) strong dislike; bitter hostility
The rival sports teams hold an animosity towards each other that has escalated from a small dislike to downright hatred.

Quandary- (n.) a state of perplexity or doubt
The confusing test question put me in a quandary because every potential answer filled me with doubt.

Suave- (adj.) smoothly agreeable or polite; pleasing to the senses
All the girls dreamed about the suave new student who had joined the class because he was sophisticated, polite, and polished.