Meaning of TIRELESS in English
[adjective]Tony is a tireless worker (= he works energetically and continuously).The prisoner's family is conducting a tireless campaign for his release.Her enthusiasm is tireless (= does not stop).The police have been tireless in their search for the child's killer.They have been tireless in raising money for guide dogs for the blind.
Cambridge English vocab. Кембриджский английский словарь. 2012