Unnerve is a verb, but unnerving is usually an adjective.
For example,
The sudden loud noise was unnerving, causing everyone in the room to jump in surprise.
Calming and unnerving are antonyms as they mean opposite things.
Creepy, scary, unnerving, spooky.
To deprive of fortitude, strength, or firmness of purpose
Some peoples mendacity should be unnerving to them.
intimidating, alarming, frightening, unnerving, disconcerting
Horrifying, dire, alarming, harrowing, shocking, unnerving, terrifying, formidable, frightening...
It can have a very unnerving effect on them it some dogs a while to get used to the new surroundings.
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"The swagger of the man was very unnerving and made everyone uncomfortable."
Nothing is more unnerving to the truly conventional than the unashamed misfit!
Because he has blank, lifeless eyes and no mouth. And he floats. Have you SEEN him? He's just unnerving.