motiveless
['motɪvlɪs]
a. 动



motiveless
[ adj ]
occurring without motivation or provocation
<adj.all>
motiveless malignityunprovoked and dastardly attack




Motiveless \Mo"tive*less\, a.
Destitute of a motive; not incited by a motive. --
{Mo"tive*less*ness}, n. --G. Eliot.