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Informal

From Biology-Online Dictionary | Biology-Online Dictionary
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Informal

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. These poor informal women. (Shak)

Origin: Pref. In- not _ formal.