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“inexcusably”
inexcusably (adverb), more inexcusably, most inexcusably
1. Pertaining to how a behavior is unpardonable: Tom was inexcusably rude towards his wife and treated her in an unforgivable way and soon after they were divorced.
2. Concerning how something is without any justification or reasonable explanation: Jack was known to be inexcusably late to all of his classes.
2. Concerning how something is without any justification or reasonable explanation: Jack was known to be inexcusably late to all of his classes.