underhand

Adjective
  1. With hand brought forward and up from below shoulder level (synset 302480006)
    "an underhand pitch"; "an underhand stroke"
  2. Marked by deception (synset 302327024)
    "achieved success in business only by underhand methods"
Adverb
  1. Slyly and secretly (synset 400489336)
    "Mean revenge, committed underhand"; "oldline aristocratic diplomats underhandedly undermined the attempt...to align Germany with the Western democracies"
  2. With the hand swung below shoulder level (synset 400488998)
    "throwing a ball underarm"

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