Definition of motiveless in US English:

motiveless

adjective

  • See motive

    • ‘He grabbed her by the shoulder and head-butted her in a motiveless and unprovoked attack.’
    • ‘But what makes this case more difficult is that it is an apparently motiveless crime.’
    • ‘He said: ‘This was a random and motiveless attack on a defenceless man.’’
    • ‘A spokesman said: ‘This totally unprovoked and motiveless assault was a terrifying ordeal for the young man who had just finished work and was making his way home.’’
    • ‘This is a motiveless, tragic murder of a young man who had everything to live for.’

Pronunciation

motiveless

/ˈmōdivləs//ˈmoʊdɪvləs/