English has many well-known colloquial synonyms for “untrustworthy”: fishy*, sketchy, shifty, shady, dodgy, dicey. (My thanks to Ben Yagoda for illuminating the last two.) But it wasn’t until recently that I learned about their close cousin sheisty, which isn’t a new word, just new to me. Blame my limited exposure to rap music, sheisty’s source.
Or at least its proximate source.