different between slightness vs meanness

English

slight +? -ness

slightness (plural slightnesses)

The property of being slight, smallness, petiteness
Poor nutrition explained his slightness.

mean +? -ness

meanness (countable and uncountable, plural meannesses)

(uncountable) The condition, or quality, of being mean (any of its definitions)
This figure is of a later date, by the meanness of the workmanship. Addison
(countable) A mean act.
- 1908, The World's Work (volume 16, page 10497)
  There are enough meannesses in everyone — ourselves included — to make for us a contemptible world, if we select the meannesses and let our minds dwell upon them.

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