falling hook line and sinker (adjective) gullible: naive, trusting
Sinonime: almost never, barely,
extra, extraordinarily,
extremely, finely, hardly, hardly ever, infrequently,
little,
notably, now and then, on rare occasions, once in a while, once in blue moon, remarkably, scarcely ever, seldom, singularly,
uncommon, uncommonly, unfrequently, unoften, unusually
Antonime: frequently,
regularly