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Unusable vs Unusably - What's the difference?

unusable | unusably |

As an adjective unusable

is not usable.

As an adverb unusably is

in an unusable manner.

unusable

English

Adjective

(en adjective)
  • Not usable.
    • The toilet was unusable because it was blocked.

    unusably

    English

    Adverb

    (en adverb)
  • In an unusable manner.
  • * 2004 , Harold McGee, On Food and Cooking
    • Hydrogenation allowed manufacturers to make a butter substitute that spreads easily even at refrigerator temperature, where butter is unusably hard.