Synonyms of 'what makes someone tick'
▷ See tick
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If you say that someone has drive, you mean they have energy and determination.
He is best remembered for his drive and enthusiasm.
The team may be lacking motivation for next week's game.
Your motive for doing something is your reason for doing it.
Police have ruled out robbery as a motive for the killing.
Thesaurus for what makes someone tick from the Collins English Thesaurus
the basic drive or motivation of a person