How acceptable is "asinine"

The relation between asinine and ass is pretty apparent, and I know that ass isn't a very acceptable word, but is asinine? If it were used in an essay for school or during discussion would it be considered vulgar or inappropriate?

Alexy's course of action in this text was rather asinine.


asinine adjective

extremely stupid or foolish:
  Lydia ignored his asinine remark

ODO

The word has one s because it's derived from the Latin asinus, "ass; donkey". There's nothing remotely vulgar about the word.

As for connotation, it imparts an air of contempt.


Asinine means ‘extremely stupid or foolish’ and is perfectly acceptable in a school context. It has nothing to do with arse, if that’s what you’re thinking.