icy
icier
clumsy
clumsier
long
longer
thin
thinner
happy
happier
good
better
friendly
friendlier
sad
sadder
nasty
nastier
mad
madder
far
further/farther
healthy
healthier
large
larger
busy
busier
silly
sillier
angry
angrier
creepy
creepier
slim
slimmer
poor
poorer
soft
softer
easy
easier
young
younger
bad
worse