adjective/tɛ.ty/
stubborn, headstrong
“Il y avait en lui tout un petit homme têtu qui haïssait Napoléon.” — There was in him a headstrong little man who hated Napoleon.
Synonyms: borné, cabochard
Related: têtu comme une mule
Inherited from Old French testu, from teste (“head”) + -u. Morphologically, from tête + -u. Compare Catalan and Occitan testut and Walloon tiestou.