-llyd

• -lyd

From lled (“width”) or lled- (“partially”), both probably from the same source word ultimately.

• (North Wales) IPA^(key): /ɬɨ̞d/
• (South Wales) IPA^(key): /ɬɪd/

-llyd

1. pejorative adjectival suffix, often indicating tendency to or abundance of

   ‎saim (“grease, fat”) + ‎-llyd → ‎seimllyd (“greasy”)

   ‎rhew (“ice, frost”) + ‎-llyd → ‎rhewllyd (“icy, frosty”)

   ‎rhagfarn (“prejudice”) + ‎-llyd → ‎rhagfarnllyd (“prejudiced”)

   ‎chwerthin (“to laugh”) + ‎-llyd → ‎chwerthinllyd (“laughable, risible”)

-lyd and -llyd are variants of the same suffix. -llyd is found after n, r and w and -lyd after other letters. The exception is m, which can be followed be either -lyd or -llyd.

R. J. Thomas, G. A. Bevan, P. J. Donovan, A. Hawke et al., editors (1950–present), “-llyd”, in Geiriadur Prifysgol Cymru Online (in Welsh), University of Wales Centre for Advanced Welsh & Celtic Studies