inquiétitude — WORRY

[uhn-KEE-ETT-ee-tewd] (n. f.) "Be quiet! Quiet down! Quiet please. He was a quiet guy, a little too quiet... On a quiet street... She lived a quiet life... Before the hold-up, the criminal had remained quiet for years... The kid had a quiet conscience." Quiet is one of those English words used in myriad ways, to express something a little different every time, a lovely feature of this pliable language. Of course, quiet comes from the French word quiéte, which is the sort of word you can easily alter with suffixes and prefixes. Inquiéte means she is worried. But if you add the suffix -itude, which is the French equivalent of -ness (think of attitude, borrowed French for aptness), you get the noun inquiétitude (un-quiet-ness) which means worry.

BONUS: A commonly used American colloquialism is no problem, or for the Terminator no problemo. The French equivalent of this is t'inquiétes [tuhn-KEE-ETT]. It's short for ne t'inquiéte pas.