"Ultraslow" validity in different word game dictionaries

Dictionary Validity
Scrabble US(US/Canada/Thailand - TWL/NWL) Yes
Scrabble UK(International - SOWPODS/CSW) Yes
Words with Friends(WWF) Yes

"ultraslow" Definition

  1. moving with, exhibiting, or marked by extremely low speed : extremely or extraordinarily slow

"ultraslow" Synonyms & Antonyms

"ultraslow" antonyms:

  • hot,
  • breakneck,
  • accelerated,
  • blistering,
  • hypersonic,
  • lightning,
  • supersonic,
  • swift,
  • turbo,
  • alacritous,
  • fleeting,
  • meteoric,
  • ultrafast,
  • ultrarapid,
  • expeditious,
  • zippy,
  • fast-moving,

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