underhand

Adjective

• marked by deception
  • achieved success in business only by underhand methods
    

• with hand brought forward and up from below shoulder level
  • an underhand pitch
    
  • an underhand stroke
    

Adverb

• with the hand swung below shoulder level
  • throwing a ball underarm
    

• slyly and secretly
  • Mean revenge, committed underhand- John Donne
    
  • oldline aristocratic diplomats underhandedly undermined the attempt...to align Germany with the Western democracies- C.G.Bowers
    

Related words

• Synonyms: 
  sneaky , underhanded , underarm , underhandedly
• Antonyms: 
  overhand , overhanded , overarm