say it: TAHYR-luh-slee
tirelessly is an adverb meaning "with indefatigable energy". It is pronounced /ˈtaɪɹləsli/ — TAHYR-luh-slee. It carries one recorded sense.
Definitions, synonyms and semantic relations for tirelessly come from Princeton University’s WordNet. The pronunciation comes from the CMU Pronouncing Dictionary. Commonness is measured against a corpus of everyday English. Full sources and licences.