indefatigably

== English == === Etymology === From indefatigable +‎ -ly, but indefatigable itself was attested later. In use since the 16th century. === Pronunciation === (General American) IPA(key): /ˌɪndəˈfætəɡəbli/ === Adverb === indefatigably (comparative more indefatigably, superlative most indefatigably) In an extremely persistent and untiring manner; in an indefatigable manner ==== Translations ==== === References ===