Difident
Adj shy, not assertive
Fidelity
N faithfulness, loyalty
Confide
V to trust (another) with information or a secret
Fallacy
N a misleading or mistaken idea
Fallacious
Adj misleading or deceptive
Fallible
Adj capable of being mistaken, imperfect
Credible
Adj to be trusted in or believed
Credence
N trust or belief
Credulity
N tendency to believe things too quickly or easily
Incredulous
Adj unable to believe something, amazed
Dubious
Adj uncertain, doubtful
Indubitable
Adj certain beyond doubt or question
Redoubtable
Adj worthy of fear or respect, mighty
Exonerate
V to prove not guilty
Docile
Adj easily taught, submissive to instruction