Curmudgeon: a bad-tempered person
synonym: crab/grouch
antonym: angel
sentence: The complaining man who work sin the next cubicle is nothing but a tired, old curmudgeon
Sojourn: a temporary stay
synonym: journey
antonym: relocation
sentence: A visit to Shakespeare’s Globe Theater made my sojourn to England complete.
Gregarious: fond of company
synonym: outgoing/social
antonym: shy/anti-social
sentence: My gregarious neighbors are the most popular couple on the block,
Augment: to increase
synonym: add/enlarge
antonym: reduce
Sentence: The professor augments his salary by moonlighting as a book editor.
Insidious: advancing in a gradual way to cause harm
synonym: treacherous/crafty
antonym: benign/harmless
Sentence: Bed bugs are insidious little creatues; you don’t know they’re there until its too late.