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English to English adverb
| 1 |
in an unpardonable manner or to an unpardonable degree |  | Example: he was inexcusably cruel to his wife
source: wordnet30
| 2 |
without any excuse |  | Example: he is unjustifiably harsh on her
source: wordnet30
| 3 |
With a degree of guilt or folly beyond excuse or justification. |  | source: webster1913
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