Word.ws English Dictionary

fast-acting

fast-acting adjective: taking effect quickly.

Adjective

fast-acting (comparative faster-acting or more fast-acting, superlative fastest-acting or most fast-acting)

  1. Taking effect quickly.
    • a fast-acting analgesic
    • Is this a fast-acting cancer?

Forms of fast-acting

comparativefaster-acting
comparativemore fast-acting
superlativefastest-acting
superlativemost fast-acting

Questions about fast-acting

What does fast-acting mean?
Fast-acting means taking effect quickly.
What part of speech is fast-acting?
Fast-acting is an adjective.

Words near fast-acting in the dictionary

  1. fast traveling
  2. fast travelled
  3. fast travelling
  4. fast travels
  5. fast yellow AB
  6. fast-acting
  7. fast-breeder reactor
  8. fast-breeder reactors
  9. fast-evolving luminous transient
  10. fast-fashion
  11. fast-flowing

Source and license

Adapted from Wiktionary: fast-acting (page history and authors). Text available under the Creative Commons Attribution-ShareAlike 4.0 license. Word.ws reformatted the entry and added links. Wiktionary data of 2026-09-02.

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Cite this entry: “fast-acting.” Word.ws, https://word.ws/fast-acting. Based on Wiktionary, CC BY-SA 4.0.