messy - messier - the messiest
cold - colder - the coldest
bad - worse - the worst
clean - cleaner - the cleanest
lazy - lazier - the laziest
long - longer - the longest
interesting - more interesting - the most interesting
difficult - more difficult - the most difficult
old - older - the oldest
young - younger - the youngest
happy - happier - the happiest
loud - louder - the loudest
busy - busier - the busiest
smart - smarter - the smartest
nice - nicer - the nicest
quiet - more quiet - the most quiet
beautiful - more beautiful - the most beautiful
expensive - more expensive - the most expensive
boring - more boring - the most boring
exciting - more exciting - the most exciting
funny - funnier - the funniest
sad - sadder - the saddest
stylish - more stylish - the most stylish
good - better - the best
cheap - cheaper - the cheapest