unpleasant and annoying
grating - annoying
If you consider something to be ‘grating’ then it is a source of irritation and annoyance to you and therefore gets on your nerves. It is typically something repetitive, and is often used in association with a harsh sound, such as nails on a chalkboard or a person’s shrill voice, but can be applied in a variety of contexts.
I find it very difficult to engage in conversation with Jenny. The sound of her voice is just so grating!
Gary is hardworking and competent, but he’s too gratingly narcissistic to be put in a position of leadership.
I liked that advertisement at first, but it’s been shown so many times now that it has become grating.