Definition of aggressiveness in English:

aggressiveness

noun

  • 1[mass noun] Hostile or violent behaviour:

    ‘recent research has linked violent video games to increased aggressiveness in youths’
    1. 1.1 Determination and forcefulness:
      ‘smaller, quicker players use their speed and aggressiveness to make up for lack of bulk’

Pronunciation:

aggressiveness

/əˈɡrɛsɪvnəs/