impractical

Meanings

1. 1
   adj

   not practical or realizable

   Your costume is impractical for the office, but works well for halloween.

2. 2
   adj

   Not practical; impracticable.

   "I can't leave you here alone with these cutthroats, and you certainly can't venture into the jungle with me; yet someone must go in search of your father. He is more than apt to wandering off aimlessly, regardless of danger or direction, and Mr. Philander is only a trifle less impractical than he. ...

Etymology

From im- + practical.