adjective
credulous
KREJ-uh-lus/ˈkredʒələs/
Too ready to believe things without enough evidence.
The credulous onlooker believes the cup floats despite its visible support.

Etymology
Latin credulus describes someone who believes readily or is trustful. The English adjective treats that readiness critically: a credulous person accepts claims without sufficiently questioning their support.
In context
for being too credulous and they were wrong the second time for being too skeptical
More examples
- She is too credulous to question his unlikely excuse.
- The article appeals to a credulous audience.
- Even skeptical people can become credulous when they hear good news.
Forms
credulous · more credulous · most credulous
credulity noun — Readiness to believe without enough evidence.
credulously adverb — With too little doubt or questioning.