na-adjective
meaningless; incomprehensible; nonsensical
Slang abbreviation of 意味不明. Used to describe something that makes no sense or is impossible to understand, often in casual online or spoken conversation.
See also: 意味不明
彼の説明は意味不すぎて、誰も理解できなかった。
His explanation was so incomprehensible that nobody could understand it.
このメール、イミフなんだけど。
This email makes no sense to me.
The full, standard form; more formal and appropriate in writing or polite speech. 意味不 is a casual, abbreviated slang version.
Abbreviation of 意味不明 (いみふめい), formed by taking the first two characters of the compound.