Definition of underhand adjective from the Oxford Advanced Learner's Dictionary

 

underhand

 adjective
adjective
BrE BrE//ˌʌndəˈhænd//
 
; NAmE NAmE//ˌʌndərˈhænd//
 
(less frequent underhanded
BrE BrE//ˌʌndəˈhændɪd//
 
; NAmE NAmE//ˌʌndərˈhændɪd//
 
)
(disapproving)
 
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secret and dishonest I would never have expected her to behave in such an underhand way. I promise you there’s nothing underhand about this agreement. Word Origin Old English in the sense ‘in or into subjection, under control’ (see under-, hand).