i 1 n 1 d 2 e 1 f 4 a 1 t 1 i 1 g 2 a 1 b 3 i 1 l 1 i 1 t 1 y 4
16 letters · 26 points in Scrabble
Meaning
noun tireless determination
originAttested from the 1630s. Derived as a compound of indefatigable + -ity.
Etymology from Wiktionary, CC BY-SA 3.0