Synonyms of 'instantaneous'
immediateDictionary, prompt, instantDeath was not instantaneous.
Copyright © 2016 by HarperCollins Publishers. All rights reserved.
You use direct to describe an experience, activity, or system which only involves the people, actions, or things that are necessary to make it happen.
He has direct experience of the process.
You use instant to describe something that happens immediately.
He had taken an instant dislike to her.
Thesaurus for instantaneous from the Collins English Thesaurus
Something that is instantaneous happens immediately and very quickly.