Congruousness refers to the quality or state of being harmonious, consistent, or compatible. Its antonyms, on the other hand, represent a lack of harmony, consistency, or compatibility. One such antonym is incongruity, which means the state of being inappropriate, disjointed, or out of place. Another antonym is discordance, which refers to a lack of agreement, harmony, or compatibility between two or more things. Contradiction, incompatibility, and dissimilarity are other antonyms for congruousness that imply a significant difference or lack of similarity between two or more things. These antonyms give us a clear idea of how opposite the notion of congruousness is and how important it is to strive for congruity in different aspects of our lives.