In a straightforward manner; straightforwards; straightforwardly.
proceeding in a straight course or manner; not deviating
easy, simple, uncomplicated, without difficulty
direct; forthright; frank; sincere
Devious people, collectively.
In an underhanded manner.
Done by moving the hand (and arm) from below.
Sly, dishonest, corrupt, cheating.
Insincere; sarcastic.
An underhanded compliment is actually criticism.
Secret; surreptitious.
His underhanded trick backfired and he was disqualified.
Understaffed.