Completely
Completely adverb - To a full extent or degree.
Usage example: she waited until we were completely finished before starting the next part
Fast and completely are semantically related In some cases you can use "Fast" instead an adverb "Completely".
Fast
Fast adverb - To a full extent or degree.
Usage example: everyone in camp was fast asleep within minutes of hitting the sack
Completely and fast are semantically related in deeply topic. Sometimes you can use "Completely" instead an adverb "Fast".
Both words in one sentence
- Watson had to use a mechanical finger and use a light sensor to know when it could play, but was still very fast and completely consistent with the buzzer in cases where it knew the response.
Source: Computers Are Fast -
She was able to catch the above mentioned Misora, while using said artifact, with next to no effort and did it so fast and completely unprecedented that even her three strongest classmates were greatly surprised.
Source: Super Speed -
Attacked on all sides and with a powerful image against it, disco was fading fast and completely dead by early 1981, and with it the fashions and styles related to or heavily associated with it (such as flared trousers).
Source: Disco
Cite this Source
Fast and Completely. (2016). Retrieved 2026, July 29, from https://thesaurus.plus/related/completely/fast
Completely & Fast. N.p., 2016. Web. 29 Jul. 2026. <https://thesaurus.plus/related/completely/fast>.
Fast or Completely. 2016. Accessed July 29, 2026. https://thesaurus.plus/related/completely/fast.
Google Ngram Viewer shows how "completely" and "fast" have occurred on timeline