Happier and the happiest
younger and the youngest
shallower, the shallowest
more difficult-the most difficult
dirtier-the dirties
more patient the most patient
hotter-the hottest
more comfortable-the most comfortable
braver-the bravest
wiser-the wisest
more friendly-the most friendly
more ridiculous-the most ridiculous
later-the latest
less-the liest