Words that are both adjectives and adverbs

(a.k.a. adjerbs)

Ending with Ly

• early
• slovenly
• gingerly
• hourly
• daily
• weekly
• monthly
• yearly
• quarterly
• timely

Not Ending with Ly

• pretty
• fast
• slow
• half
• straight
• late
• low
• hard
• bright
• safe
• better, best
• first, second ...

see http://www.englishpractice.com/improve/words-adjectives-adverbs/