Unflagging (13)
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">unflagging</span>' is the definition.<br/ ><span class="explanation-format__explanation">(synonyms)</span><br/ ><br/ >This is the entire clue.<br/ ></span>
(Other definitions for indefatigable that I've seen before include "Assiduous" , "Unremitting" , "Tireless" , "Persisting tirelessly" , "Persistent" .)
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">unflagging</span>' is the definition.<br/ ><span class="explanation-format__explanation">(synonyms)</span><br/ ><br/ >This is the entire clue.<br/ ></span>
(Other definitions for tireless that I've seen before include "Having great energy" , "Never wearying" , "Full of energy" , "Never grows weary, inexhaustible" , "Having inexhaustible energy" .)