Ffyrf, a. thick; firm, steady
Ffyrfau, v. to become thick
Ffyrfder, n. thickness firmness
Ffyrfeiddio, v. to become firm; to make firm
Ffyrfiant, n. thickness
Ffyrnig, a. fierce
Ffyrnigo, v. to grow fierce
Ffyrnigrwydd, n. fierceness
Ffysg, n. impetuosity: a. hasty, impetuous
Ffysgiad, n. a hastening