1.
Someone who is ~ has a mind that does not work in a normal way, with the result that their behaviour is very strange.
Some people simply can’t take it and they just go ~...
= mad
ADJ: usu v-link ADJ
2.
If you describe a decision or action as ~, you think it is very foolish or excessive.
I said, ‘Listen, this is completely ~.’
ADJ disapproval
~ly
I would be ~ly jealous if Bill left me for another woman.
ADV: usu ADV adj, also ADV with v