Usually means: Extremely slow, beyond normal slowness.
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We found 3 dictionaries that define the word ultraslow:

General (3 matching dictionaries)
  1. ultraslow: Merriam-Webster
  2. ultraslow: Collins English Dictionary
  3. ultraslow: Wiktionary

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Definitions from Wiktionary (ultraslow)

▸ adjective:  Extremely slow; of utmost sluggishness.

Similar:
superslow, ultrarapid, ultrasoft, ultraquick, ultralong, ultralaborious, ultraswift, ultrathick, ultraefficient, ultracold, more...

Opposite:
ultrafast, rapid, quick, speedy, swift

▸ Words similar to ultraslow

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Similar:
superslow, ultrarapid, ultrasoft, ultraquick, ultralong, ultralaborious, ultraswift, ultrathick, ultraefficient, ultracold, more...

Opposite:
ultrafast, rapid, quick, speedy, swift



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