lightning fast

Fetched 2026-10-26 (cache).

Synonyms: lightning flash

Antonyms: lightning flash

Related words from Datamuse; suggestions, not definitions.

Adjective

1. {{lb|en|idiom}} [[extremely|Extremely]] [[fast]], fast as [[lightning]].

Adverb

1. {{lb|en|idiom}} Extremely [[quickly]].

Source: Wiktionary · CC BY-SA 4.0 (Wiktionary dump) · cached copy, not a rewrite.