DISCONSONANT is an adjective that describes two or more sounds that are not harmonious when heard together. INCONGRUOUS is an adjective that means INCONGRUOUS or out of place. Together, these two words describe a situation in which two or more sounds are discordant and do not fit together. This could be used to describe a musical piece that has two or more notes that clash, or a conversation in which two people's voices are not in harmony.