n. An absence (or rejection) of belief, especially religious belief
the GNU version of the Collaborative International Dictionary of English
n. The withholding of belief; doubt; incredulity; skepticism.
n. Disbelief; especially, disbelief of divine revelation, or in a divine providence or scheme of redemption.
The Century Dictionary and Cyclopedia
n. Incredulity; the withholding of belief; disbelief; especially, disbelief of divine revelation.
n. Disbelief of the truth of the gospel; distrust of God's promises and faithfulness, etc. Mat. xiii. 58; Mark vi. 6; Heb. iii. 12.
WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.
n. a rejection of belief
Word Usage
"There are times when the word unbelief is used to describe the doubts of those who are definitely believers but only when they are at a stage of doubting which is rationally inexcusable and well on the way to becoming full-grown unbelief e.g."