Definition of mirthlessly in English:

mirthlessly

adverb

See mirthless

‘‘Yeah, uh…’ she trailed off then laughed mirthlessly as there was nothing funny about the situation.’
  • ‘‘I'll go mum,’ Melanie said, poking mirthlessly at her pancake imagining it was Neli's head.’
  • ‘He glances down, smiles mirthlessly, and switches the picture from his right hand to his left.’
  • ‘Another tall guy with dark hair that splashed around his shoulders laughed mirthlessly.’
  • ‘Athena chuckled mirthlessly, truth be told, she was glad things had turned out the way they did.’