無限 むげん かい微分 びぶん可能 かのうじゃなかったです
mugenkai bibunkanōjanakattadesu

Desu Copula
na-Adjective

The polite, past negative form of 無限回微分可能

1. Was not infinitely differentiable.; Wasn't infinitely differentiable.

Past/Perfective
Negative
Polite
Casual Register
Mathematics