lightning fast

== English == === Alternative forms === lightning-fast (adjective) === Pronunciation === === Adjective === lightning fast (not comparable) (idiomatic) Extremely fast, fast as lightning. Synonyms: fulgurant, lightning-quick, quick as a flash, in a flash ==== Translations ==== === Adverb === lightning fast (not comparable) (idiomatic) Extremely quickly. Synonyms: quick as a flash, in a flash, lightningly ==== Translations ====