Is Fastly a Word?

Many English learners use the word “fastly” as an adverbial form of “fast”, which seems quite logical because this is the way adverbs are usually formed. If something is slow, we say that it “moves slowly”, and such usage is completely correct.

Is fastly a correct word?

9 Answers. There is no need for "fastly" because "fast" is both an adjective and an adverb. So, "I ran fast" is completely correct. The existence of "fast" as an adverb does not preclude the future development of a word "fastly", but it does hinder it.

What is the meaning of fastly?

Filters. Securely. We tied the rope fastly this time, we didn't want the cow to get away again. adverb.