All 5 Uses

antagonism
in
Invisible Man, by Ellison
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She was alone and I thought, Well, at least I'm not too early ...."Good morning," she said, betraying none of the antagonism I had expected.†
Chpt 8 *

antagonism = hostility or opposition
Some looked at me strangely, but I dismissed it since it didn't appear to be antagonism.†
Chpt 8
Had he shown any antagonism when he saw me?†
Chpt 9
After all, there was antagonism to our being employed.†
Chpt 10
I'd never met that kind of antagonism before.†
Chpt 20

Definitions:

(1) (antagonism)
hostility, opposition, or tension between opposing forces or ideas
(2) (meaning too rare to warrant focus)
More rarely, antagonism can refer to the relation between opposing principles, forces, or factors. In biochemistry, it can refer specifically to one chemical's interference with another.