Denial (also called abnegation) is a defense mechanism postulated by Sigmund Freud, in which a person is faced with a fact that is too uncomfortable to accept and rejects it instead, insisting that it is not true despite what may be overwhelming evidence. [1] The subject may use:
simple denial: deny the reality of the unpleasant fact altogether
minimisation: admit the fact but deny its seriousness (a combination of denial and rationalization)
projection: admit both the fact and seriousness but deny responsibility.