Imperturbable (adj) not easily excited; emotionally stable im- in front of something means no so its not perturbable
Increment (n.) An enlargement, increase, addition Syn: accretion, gain Ant: loss, reduction, decrease Think of increment as increase Increment = Increase
PEREGRINATION noun: the act of traveling; an excursion, especially on foot or to a foreign country pereGRINATION sounds like MIGRATION, which has similar meanings! Sheep herders could be on a constant peregrination
Refulgent Shining, radiant, resplendent Light bulbs are FUL of light – brighten a dark room
Shibboleth (n.) A word, expression, or custom that distinguishes a particulary group of persons from all others; a commonplace, saying, or truism Syn: catchphrase, password, slogan The ending –eth is commonly found in Shakespearean language Ex: Cometh away with me
Vituperative (adj.) harshly abusive, severely scolding Syn.- Abusive, scurrilous, insulting Ant.- Complimentary, laudatory, flattering Jerry scolded his dog vituperatively after his dog went to the bathroom on the new rug.