From Longman Dictionary of Contemporary Englishtousletou‧sle /ˈtaʊzəl/ verb [transitive] DCto make someone’s hair look untidy→ See Verb table
Examples from the Corpus
tousle• She was smiling out at him, her long blond hair tousled.• His hair was all tousled, a scarf round his neck, touching his braces.• Two great tousled blonde manes with platinum highlights.• Springing up, she smoothed back her tousled hair and hurriedly unbolted the door to Bethany smiling at her.• He could sec her troubled eyebrows, her tousled hair as she sat brooding about what might be happening in Rome.• Under the tousle of thick blond hair, he looks like a small child again.• Her hair, which Polly had thought a mess, might also have been described as gloriously tousled, ravishingly unkempt.• It would have been too similar to the accompanying picture featuring a slightly tousled Stafford kissing Celestine.Origin tousle (1400-1500) touse “to pull roughly” ((14-19 centuries)) 