Antonyms of some: many, all, most, majority Synonyms of some: a few, several, a couple, minority
Since paranoia involves an excess of suspicion, we could say that an excess of trust would the opposite state, which we could describe as naivety.
agree
Smart, intelligent, wise, brainy.
Adept, able, skilled, fit.Adept, skilled, adroit, useful, helpful, clever...