Fright-ful, dychrynllyd
Fri-gid, oer, oerllyd; marwaidd
Frol-ic, cellweirgamp; gorhoenus
Frost-y, rhewlyd, rhewllyd
Fro-ward, anynad, anhywaith
Frown-ing, cuchiog, cilygus
Fro-zen, rhewedig; ceuledig
Fru-gal, cynnil, ymarbedus
Fruit-ful, ffrwythlawn, cnydfawr
Frus-trate, seithug, ofer: seithugo; somi