Impossible to have: unhavnable goals.
unhavnability un·hav·na·bil·i·ty n.
unhavnably un·hav·na·bly adv.
The origin of this word is uncertain, but it can be considered the inevitable consequence of AIM.
"There was a time when walking on the moon was considered unhavnable."
"When chatting online, being pedantic is oftentimes unhavnable."