dishonestly (part of speech: adverb)
- You'll do yours underhandedly. - "'Firebrand' Trevison", Charles Alden Seltzer.
- And, fatally, it followed that Natacha, in that infernal intrigue, negotiated for the life of her father through the agency of a man who, underhandedly, sought to strike at the general himself, because the immediate death of her father before the negotiation was completed would enrich Natacha, who had given Michael so much to hope. - "The Secret of the Night", Gaston Leroux.
- The grand skinflint, the master usurer of the time, Jean V, duke of Brittany, refused to publish the edict in his states, but, underhandedly, notified all those of his subjects who dealt with Gilles. - "LÃ -bas", J. K. Huysmans.