underhanded

adj. underhand; clandestine, secret, sly, crafty; not having enough people, short-handed

Adjective
1. marked by deception; "achieved success in business only by underhand methods"
(synonym) sneaky, underhand
(similar) crooked, corrupt
2. with hand brought forward and up from below shoulder level; "an underhand pitch"; "an underhand stroke"
(synonym) underhand, underarm
(classification) sport, athletics

(a.)
Underhand; clandestine.
  

(a.)
Insufficiently provided with hands or workers; short-handed; sparsely populated.
  

not legal, not according to rules, not above board Some people say the government was underhanded in dealing with the Indians.

Synonyms and related words:
amoral, artful, back-door, backstairs, calculating, chiseling, clandestine, collusive, conscienceless, corrupt, corrupted, covert, covinous, crafty, criminal, crooked, cunning, dark, deceitful, devious, dishonest, dishonorable, doubtful, dubious, duplicitous, evasive, FALSE, falsehearted, feline, felonious, finagling, fishy, fraudulent, furtive, guileful, hidlings, hole-and-corner, hugger-mugger, ill-got, ill-gotten, immoral, indirect, insidious, not kosher, privy, questionable, quiet, rotten, scheming, shady, shameless, sharp, shifty, sinister, skulking, slinking, slinky, slippery, sly, sneaking, sneaky, stealthy, surreptitious, suspicious, treacherous, trickish, tricky, two-faced, unconscienced, unconscientious, unconscionable, under-the-counter, under-the-table, undercover, underground, underhand, undermanned, understaffed, unethical, unobtrusive, unprincipled, unsavory, unscrupulous, unstraightforward, wily, without remorse, without shame