Discredit

Word of the Day - Discredit

dis·cred·it
[dis-kred-it]

verb (used with object)
1.to injure the credit  or reputation of; defame: an effort to discredit honest politicians.

2.to show to be undeserving of trust or belief; destroy confidence in: Later research discredited earlier theories.

3.
to give no credence to; disbelieve: There was good reason to discredit the witness.

noun

4. loss or lack of belief or confidence; disbelief; distrust: His theories met with general discredit.

5.
loss or lack of repute or esteem; disrepute.

6.
something that damages a good reputation: This behavior will be a discredit to your good name.