motiveless

This duplicity was not motiveless, although, on a cursory view, its purpose may not be apparent.

It is also a sign of the stiffening of the resistant "malice," or "motiveless malignity," which opposes creation.

He showed that myth displayed a regularity of development not to be accounted for by motiveless fancy, but by laws of formation.

She had effected her purpose, which was perfectly motiveless, by concealing combustibles in different parts of the house.

He was forcibly struck with the blind and comparatively motiveless pugnacity of the Squire's conduct.