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The definition of underhand

3 Definitions of: underhand

1. adjective, clandestine, deceptive, or secretive
2. adjective, sport. another word for underarm
3. adverb, in an underhand manner or style
4. Show me some examples of this word: underhand
5. Show me the etymology of the word: underhand

Synonyms:	surreptitious, secret, sly, crooked (informal), devious, secretive, fraudulent, treacherous, dishonest, deceptive	And more...
Antonyms:	honest

From Collins