un·der·hand·ed 
/ˌʌndɚˈhændəd/ adjective
/ˌʌndɚˈhændəd/ adjective 1 [more underhanded; most underhanded] chiefly US : done in a secret and dishonest way : intended to deceive or trick someone
▪ People resented the underhanded [=(chiefly Brit) underhand] way that he came to power. ▪ underhanded tactics/methods 2 US : 1underhand 1
▪ an underhanded throw
▪ People resented the underhanded [=(chiefly Brit) underhand] way that he came to power. ▪ underhanded tactics/methods
▪ an underhanded throw
— underhanded adverb, US
▪ She threw the ball underhanded.
▪ She threw the ball underhanded.
