(a) n. unbelief, paganism; (b) adj. unbelieving.

Straying from the ways of wisdom or prudence; under the influence of error, misguided. Obsolete or archaic.

Wrong-thinking.

? Holding erroneous tenets.

Chiefly in predicative use. Far from the truth; that errs in opinion or belief; mistaken. Obsolete.

Deluded, imposed upon, misled, mistaken, etc.: see the verb.

Erring in opinion, conduct, etc.; deviating from the correct standard.

Endowed or imbued with wrong or perverse learning.

Of the nature of, or holding, a false opinion. Obsolete. rare.

Of a person: holding faulty or wrong opinions. Obsolete.

Of persons: Holding opinions not in accord with some acknowledged standard. in other matters of belief or opinion.