Containing insult, or having the intention of insulting.
The act of giving insult.
An underhanded compliment is actually criticism.
Done by moving the hand (and arm) from below.
Sly, dishonest, corrupt, cheating.
Insincere; sarcastic.
Secret; surreptitious.
His underhanded trick backfired and he was disqualified.
Understaffed.
Devious people, collectively.
In an underhanded manner.