English edit

Etymology edit

over- +‎ fast

Adjective edit

overfast (comparative more overfast, superlative most overfast)

  1. Too quick.

Adverb edit

overfast (comparative more overfast, superlative most overfast)

  1. Too quickly.
    • 1914-1915, Arthur Conan Doyle, The Valley of Fear
      MacDonald shook his head. “Man, you are surely travelling overfast,” said he. “I have heard no evidence yet that any stranger was ever in the house at all.”