Mawson, C.O.S., ed. (1870–1938). Roget’s International Thesaurus. 1922.

Class IV. Words Relating to the Intellectual Faculties
Division (I) Formation of Ideas
Section V. Results of Reasoning

486. Credulity.

   NOUN:CREDULITY, credulousness &c. adj.; gullibility, cullibility [obs.]; gross credulity, infatuation; self-delusion, self-deception; superstition; one’s blind side; bigotry (obstinacy) [See Obstinacy]; hyperorthodoxy [See Heterodoxy]; misjudgment [See Misjudgment].
  CREDULOUS PERSON (dupe) [See Dupe].
   VERB:BE CREDULOUS &c. adj.; jurare in verba magistri [L.]; follow implicitly; swallow, swallow whole, gulp · down; take on trust; take for -granted, – gospel; take on faith; run away with -a notion, – an idea; jump -, rush- to a conclusion; think the moon is made of green cheese; take -, grasp- the shadow for the substance; catch at straws.
  IMPOSE UPON (deceive) [See Deception].
   ADJECTIVE:CREDULOUS, gullible; easily deceived [See Deception]; simple, green, soft, childish, silly, stupid; easily convinced; overcredulous, overconfident, overtrustful; easy to stuff [slang]; infatuated, superstitious; confiding (believing) [See Belief].
  1. The wish is father to the thought.
  2. Credo quia impossibile.—Tertullian
  3. All is not gold that glitters.
  4. No es oro todo lo que reluce.
  5. Omne ignotum pro magnifico.
  6. And still they gazed, and still the wonder grew That one small head could carry all he knew.—Goldsmith