Hyddrwg, a. apt to be bad
Hyddwyn, a. easily carried
Hyddysg, a. well-versed, docile
Hyddysgedd, n. aptness to learn
Hyddysgu, v. to learn quickly
Hyddysgwr, quick learner
Hyedd, n. boldness
Hyf, a. bold, paring, confident
Hyfaad, n. a becoming bold
Hyfâeth, a. nourishable