cred·u·lous 
(krĕjə-ləs)
(krĕjə-ləs)adj.
1. Disposed to believe too readily; gullible.
2. Arising from or characterized by credulity. See Usage Note at credible.
[From Latin crēdulus, from crēdere, to believe; see kerd- in the Appendix of Indo-European roots.]
credu·lous·ly adv.
credu·lous·ness n.
- proportionality
- proportionally
- proportional representation
- proportionate
- proportionately
- proportionateness
- proportioner
- proportionment
- proposal
- propose
- proposer
- proposition
- propositional
- propositional calculus
- propositional function
- propositionally
- propositus
- propound
- propounder
- propoxyphene
- propraetor
- propraetorial
- propraetorian
- propranolol
- propria