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