gullible (adjective) gullible: naive, trusting
Sinonime: bonkers*, brainsick, crackers,
crazy, crazy as a loon, cuckoo, daft, demented, deranged,
distraught,
disturbed, dotty, kooky, loco, lunatic, mad, mad as a hatter,
maniac, maniacal, mentally ill, moonstruck, not all there, nuts, nutty as a fruitcake, off one's rocker, out of one's mind, out to lunch, psycho,
sick, sick in the head, stark raving mad, touched*, unbalanced, unhinged, unsound, wacky
Antonime: astute,
discerning,
knowledgeable,
perceptive,
suspicious, unbelieving, untrusting,
wise