far
comparative - farther/further; superlative - the farthest/furthest
interesting
comparative - more interesting; superlative - the most interesting
little
comparative - less; superlative - the least
attractive
comparative - more attractive; superlative - the most attractive
crowded
comparative - more crowded; superlative - the most crowded
Bad
comparative - worse; superlative - the worst
fast
comparative - faster; superlative - the fastest
nice
comparative - nicer; superlative - the nicest
clean
comparative - cleaner; superlative - the cleanest
quiet
comparative - quieter; superlative - the quietest
famous
comparative - more famous; superlative - the most famous
ugly
comparative - uglier; superlative - the ugliest
slowly
comparative - more slowly; superlative - the most slowly
big
comparative - bigger; superlative - the biggest
carefully
comparative - more carefully; superlative - the most carefully
healthy
comparative - healthier; superlative - the healthiest
hot
comparative - hotter; superlative - the hottest
beautiful
comparative - more beautiful; superlative - the most beautiful