stultify

To cause to lose interest or feel dull and not alert.

To render useless or ineffectual.

To cause to appear stupid, inconsistent, or ridiculous.

To claim incapacity as setting aside or preventing enforcement of (a deed or contract).

To make or cause to appear foolish; reduce to foolishness or absurdity: used of persons or things.

To look upon as a fool; regard as foolish.

In law, to allege one’s own insanity.

To make foolish; to make a fool of.

To regard as a fool, or as foolish.

To allege or prove to be of unsound mind, so that the performance of some act may be avoided.