Fast
Fast adjective - Moving, proceeding, or acting with great speed.
Split-second and fast are semantically related In some cases you can use "Split-second" instead an adjective "Fast".
Split-second
Split-second adjective - Done or occurring without any noticeable lapse in time.
Usage example: a day trader who is used to making split-second decisions
Fast and split-second are semantically related in immediate topic. Sometimes you can use "Fast" instead an adjective phrase "Split-second".
Both words in one sentence
- His other two skills require split-second reaction, either blocking enemy projectiles or reacting on windows of opportunity as fast as 0.1 seconds.
Source: Difficult but Awesome - This, despite the fact that he's been shown to vanish in a split-second when he confronts Tom halfway through the movie (so obviously he moves fast).
Source: Lowered Monster Difficulty -
It goes by incredibly fast, but if you pause at exactly the right split-second at 51:35, you might see this◊ vision of the Infinity Gems.
Source: Film / Avengers: Age of Ultron
Cite this Source
Split-second and Fast. (2016). Retrieved 2026, August 15, from https://thesaurus.plus/related/fast/split-second
Fast & Split-second. N.p., 2016. Web. 15 Aug. 2026. <https://thesaurus.plus/related/fast/split-second>.
Split-second or Fast. 2016. Accessed August 15, 2026. https://thesaurus.plus/related/fast/split-second.
