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The Collaborative International Dictionary
Motiveless

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

Douglas Harper's Etymology Dictionary
motiveless

1817, from motive (n.) + -less.

Wiktionary
motiveless

a. Without a motive.

WordNet
motiveless

adj. occurring without motivation or provocation; "motiveless malignity"; "unprovoked and dastardly attack"- F.D.Roosevelt [syn: unprovoked, wanton]

Usage examples of "motiveless".

Conclusion Criminal personality profiling has proved to be a useful tool to law enforcement in solving violent, apparently motiveless crimes.