different between inexcusable vs inexcusableness

English

From Middle French inexcusable, from Latin inexcusabilis

inexcusable (comparative more inexcusable, superlative most inexcusable)

inexcusable (plural inexcusables)

inexcusable +? -ness

inexcusableness (uncountable)

The quality of being inexcusable.
- 1744 (first published), Robert South, Five additional volumes of sermons preached upon several occasions
  The other thing that we infer from the precedent discourse , is the inexcusableness of those persons , who professing religion , yet live below a principle much inferior to religion

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