Fast
Fast adjective - Firmly positioned in place and difficult to dislodge.
Usage example: the rusty, old screws are so fast in the fitting that there's no hope of getting them out
Immovable is a synonym for fast in fixed topic. In some cases you can use "Immovable" instead an adjective "Fast", when it comes to topics like stable, stuck.
Immovable
Immovable adjective - Incapable of moving or being moved.
Usage example: that boulder is immovable, even with a bulldozer
Fast is a synonym for immovable in fixed topic. Sometimes you can use "Fast" instead an adjective "Immovable", if it concerns topics such as characteristic, stable.
Nearby Words: immovability, immovably
Mutual synonyms
Both words in one sentence
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Often, characters will be Squashed Flat by some heavy object landing on their head, or by going really fast into an immovable object such as a wall, or a big and heavy character will squash a smaller character and leave them stuck to their bodies like Butt Stickers.
Source: Squashed Flat - Uncapped damage, extremely high Strength and Magic, Immovable MAX, and extremely fast attacking speed.
Source: Game Breaker / Final Fantasy -
Why, you do something that will inflict the pain of having one's skin torn off by fast-moving asphalt while being flung around chaotically, occasionally being thrown, at high speed, into stationary and possibly immovable objects!
Source: What a Drag
Cite this Source
Immovable and Fast. (2016). Retrieved 2026, August 15, from https://thesaurus.plus/related/fast/immovable
Fast & Immovable. N.p., 2016. Web. 15 Aug. 2026. <https://thesaurus.plus/related/fast/immovable>.
Immovable or Fast. 2016. Accessed August 15, 2026. https://thesaurus.plus/related/fast/immovable.
Google Ngram Viewer shows how "fast" and "immovable" have occurred on timeline