different between aggressiveness vs eagerness

English

aggressive +? -ness

aggressiveness (usually uncountable, plural aggressivenesses)

(uncountable) The state or quality of being aggressive.
(uncountable) The propensity of a soil or water to dissolve metal or cement structures.
The aggressiveness of various sulfate salts towards concrete is partly related to solubility.
(countable) The result or product of being aggressive.

From Middle English egernesse, egrenesse; equivalent to eager +? -ness.

eagerness (usually uncountable, plural eagernesses)

The state or quality of being eager; ardent desire.
- 1909: Frances Hodgson Burnett, The Secret Garden
  The things he had to tell about...were enough to make you almost tremble with excitement, when you heard all the intimate details from an animal charmer and realized with what thrilling eagerness and anxiety the whole busy underworld was working.
(obsolete) Tartness; sourness

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