indefatigably
in·de·fa·tigably
adverb
1.
Origin
From indefatigable + -ly, but indefatigable itself was attested later. In use since the 16th century.
Related words
Pertaining to
WordNet 2.1 (Princeton University). Wiktionary (CC BY-SA). CMU Pronouncing Dictionary. WordNet 2.1 Copyright Princeton University. All rights reserved. Wiktionary content is available under the Creative Commons Attribution-ShareAlike Licence.