Search Result for "tirelessness": 
Wordnet 3.0

NOUN (1)

1. tireless determination;
[syn: indefatigability, indefatigableness, tirelessness]



WordNet (r) 3.0 (2006):

tirelessness
    n 1: tireless determination [syn: indefatigability,
         indefatigableness, tirelessness]