Denial

noun

1. The negation in logic.

   "The denial of "There might be X" is the null, "False, there is no X.""

2. A refusal to comply with a request.

   "Every time we asked for an interview we got a denial."

3. An assertion of untruth.

   "The singer has issued a sweeping denial of all the rumors."

4. Refusal to believe a problem exists

   "We couldn't break through his denial about being alcoholic."

5. A defense mechanism involving a refusal to accept the truth of a phenomenon or prospect.

   "He is in denial that he has a drinking problem."