Cymwynasgar, a. natured, kind, courteous, good
Cymwynasu, v. to act kindly
Cymydog, n. neighbour
Cymydogaeth, n. neighbourhood
Cymydoges, n. neighbour
Cymydogol, a. neighbourly
Cymyliad, n. clouding
Cymylog, a. cloudy, gloomy
Cymylu, v. to become cloudy
Cymyn, n. bequest; an excision