Someone who keeps trying and trying to learn a skill and who never gives up is an example of a person who would be described as indefatigable.
Origin of indefatigableMiddle French indéfatigable from Classical Latin indefatigabilis from in-, not + defatigare, to tire out, weary: see de- and fatigue
Origin of indefatigableObsolete French indéfatigable from Latin indēfatīgābilis in- not ; see in- 1. dēfatīgāre to tire out ( dē- intensive pref. ; see de- . ) ( fatīgāre to weary )
(comparative more indefatigable, superlative most indefatigable)
- defatigable (much less common)
From Middle French, from Latin indēfatīgābilis (“untiring”), from in- (“not”) + de- (“away”) + fatīgō (“I tire”).