Definition of indefatigable

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< indef.

indefeasible >

in·de·fat·i·ga·ble    (nd-ft-g-bl) KEY 

ADJECTIVE:

Incapable or seemingly incapable of being fatigued; tireless. See Synonyms at tireless.

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ETYMOLOGY:
Obsolete French indéfatigable, from Latin indfatgbilis : in-, not ; see in-¹ + dfatgre, to tire out ( d-, intensive pref.; see de- + fatgre, to weary)

OTHER FORMS:
inde·fati·ga·bili·ty or inde·fati·ga·ble·ness(Noun), inde·fati·ga·bly(Adverb)