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 amp; fatigue
Origin of indefatigableObsolete French indéfatigable, from Latin ind&emacron;fat&imacron;g&amacron;bilis : in-, not; see in–1 + d&emacron;fat&imacron;g&amacron;re, to tire out (d&emacron;-, intensive pref.; see de– + fat&imacron;g&amacron;re, 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”).