Might mean (unverified): Extremely quick, almost instantaneous speed.
Definitions Related words Mentions
We found 2 dictionaries that define the word lightning fast:

General (2 matching dictionaries)
  1. Lightning-fast, lightning-fast: Wordnik
  2. lightning fast: Wiktionary

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Definitions from Wiktionary (lightning fast)

▸ adjective:  (idiomatic) Extremely fast, fast as lightning.
▸ adverb:  (idiomatic) Extremely quickly.

Similar:
lightning-quick, quick as lightning, lightning, quick as a flash, superfast, hyperfast, blazing, rapid, fast and furious, superquick, more...

Opposite:
slow, sluggish, leisurely, unhurried, plodding

Types:
instantaneous, immediate, swift, rapid, speedy, expeditious, more...

▸ Words similar to lightning fast

▸ Usage examples for lightning fast

▸ Idioms related to lightning fast

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▸ Popular nouns described by lightning fast

▸ Words that often appear near lightning fast

▸ Rhymes of lightning fast

▸ Invented words related to lightning fast

Similar:
lightning-quick, quick as lightning, lightning, quick as a flash, superfast, hyperfast, blazing, rapid, fast and furious, superquick, more...

Opposite:
slow, sluggish, leisurely, unhurried, plodding

Types:
instantaneous, immediate, swift, rapid, speedy, expeditious, more...



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