A dodgy situation is risky and suspicious. A dodgy person is skilled in lying and deceiving. Neither should be trusted.

When a person or situation is called dodgy, it's a clue that they should be dodged if at all possible. A job might be dodgy because it's illegal or dangerous. A shortcut might be dodgy if it could damage your car. Running a marathon without preparation is very dodgy. Similarly, a dodgy person is untrustworthy because they’re evasive, cunning, sly, or just a flat-out liar.

Definitions of dodgy

adj of uncertain outcome; especially fraught with risk

chanceful, chancy, dicey
dangerous, unsafe
involving or causing danger or risk; liable to hurt or harm

adj marked by skill in deception

crafty, cunning, foxy, guileful, knavish, slick, sly, tricksy, tricky, wily
marked by skill in achieving a desired end especially with cunning or craft

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