1. in a way that produces a harsh, discordant, or unpleasant sound or effect
Usage: often used in musical or auditory contexts
2. in a way that is inconsistent, conflicting, or at odds with something else
Usage: figurative use; often applied to ideas, statements, or behaviors

Examples

• The two instruments played dissonantly, creating an unsettling effect.
• His cheerful tone spoke dissonantly with the grim news he delivered.
• The colors clashed dissonantly on the canvas.
• Her optimistic words rang dissonantly against the pessimistic data.
• The orchestra's strings sounded dissonantly out of tune.
• The modern building stood dissonantly among the historic structures.