Underhanded

Adjective

1. Done by moving the hand (and arm) from below.
2. Sly, dishonest, corrupt, cheating.
3. Insincere; sarcastic.
4. Secret; surreptitious.
5. Understaffed.

Synonyms

• (all, except "understaffed"): underhand
• (understaffed): shorthanded

Adverb

1. In an underhanded manner.

Synonyms

• (in an underhanded manner): underhandedly