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tireless

adjective
 
 
/ˈtaɪə.ləs/ US  /ˈtaɪr-/

Definition

working energetically and continuously: Tony is a tireless worker. The prisoner's family is conducting a tireless campaign for his release. The police have been tireless in their search for the child's killer.Energetic and lively tirelessly
 
 
/-li/ adverb
Sylvia Pankhurst campaigned tirelessly for votes for women.Energetic and lively
(Definition of tireless adjective from the Cambridge Advanced Learner's Dictionary & Thesaurus © Cambridge University Press)

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