jarring
adjective
the jarring juxtaposition of opposites:
clashing, conflicting, contrasting, incompatible, incongruous;
discordant, dissonant, inharmonious;
harsh, grating, jangling, strident, shrill, cacophonous;
out of place, unsuitable, inappropriate;
disagreeable, unpleasant, offensive.
▷antonyms harmonious; pleasing.
jar (2) Oxford Dictionary of English