untirabilityn.
(un- prefix1 6. Cf. untirable adj.)
ΘΚΠ
the world > physical sensation > sleeping and waking > weariness or exhaustion > [noun] > capability of being wearied > not wearied or able to be wearied
unweariednessa1617
indefatigability1651
indefatigableness1653
untirability1855
tirelessness1887
1855 Househ. Words X. 31/2 Hence..a rapidity of hæmatosis, which explains the untirability of the wings of birds.
This entry has not yet been fully updated (first published 1926; most recently modified version published online June 2019).
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n.1855