• (British) IPA: /ˈdɪ.fɪ.saɪl/
• (America) IPA: /ˈdɪ.fə.səl/

difficile

1. (obsolete) Hard to work with; stubborn.
2. (obsolete) Difficult.
   • 1603, Michel de Montaigne, John Florio, transl., The Essayes, […], printed at London: By Val[entine] Simmes for Edward Blount […], OCLC 946730821 ↗:

     , Folio Society, 2006, vol.1, p.185:

     […] forasmuch as he was to judge of an internall beauty, of a difficile knowledge, and abstruse discovery.

• Portuguese: difícil
• Russian: несгово́рчивый