Definitions of denial

Pretending something does not exist when in reality it does
Being willing to admit there is a problem, but unwilling to see the severity of it
Seeing the problem as being caused by something or someone else. The behaviour is not denied, but its cause is someone else's responsibility.
Offering excuses, alibis, justifications, and other explanations for behaviour
Dealing with the problem on a general level; avoiding personal and emotional awareness of the situations or conditions
Changing the subject to avoid threatening topics
Becoming angry and irritable when reference is made to the condition. This helps to avoid the issue