Secret; clandestine; hence, mean; unfair; fraudulent.
- Marked by or done in a deceptive, secret, or sly manner; dishonest and sneaky. See Synonyms at secret.
- Sports Executed with the hand brought forward and up from below the level of the shoulder; underarm: an underhand pitch.
- With an underhand movement: Throw the ball underhand.
- In a sly and secret way.