Disposed to believe on little evidence.

Roget 484: believing etc. v.; certain, sure, assured, positive, cocksure, satisfied, confident, unhesitating, convinced, secure.    under the impression; impressed with, imbued with, penetrated with.    confiding, suspectless^†; unsuspecting, unsuspicious; void of suspicion; credulous etc. 486; wedded to.    believed etc. v.; accredited, putative; unsuspected.    worthy of, deserving of, commanding belief; credible, reliable, trustworthy, to be depended on; satisfactory; probably etc. 472; fiducial^†, fiduciary; persuasive, impressive.    relating to belief, doctrinal.    ... show more

Roget 486: credulous, gullible; easily deceived etc. 545; simple, green, soft, childish, silly, stupid; easily convinced; over-credulous, over confident, over trustful; infatuated, superstitious; confiding etc. (believing) 484.    ... show more

Roget 481: misjudging etc. v.; ill-judging, wrong-headed; prejudiced etc. v.; jaundiced; shortsighted, purblind; partial, one-sided, superficial.    narrow-minded, narrow-souled^†; mean-spirited; confined, illiberal, intolerant, besotted, infatuated, fanatical, entete [Fr.], positive, dogmatic, conceited; opinative, opiniative^†; opinioned, opinionate, opinionative, opinionated; self-opinioned, wedded to an opinion, opini=atre; bigoted etc. (obstinate) 606; crotchety, fussy, impracticable; unreasonable, stupid etc. 499; credulous etc. 486; warped.    misjudged etc. v.. ... show more

Roget 547: credulous etc. 486; mistaken etc. (error) 495.   

Showing a lack of judgment or experience.

Polish: prostoduszny