underhandedly

Từ điển WordNet v3.1 - WordNet Dictionary

adverb

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
• Syn:
underhand
• Derived from adjective:
underhand