Category:Informal

In*form"al, a. Etym: [Pref. in- not + formal.]

1. Not in the regular, usual, or established form; not according to official, conventional, prescribed, or customary forms or rules; irregular; hence, without ceremony; as, an informal writting, proceeding, or visit.

2. Deranged in mind; out of one's senses. [Obs.] These poor informal women. Shak.