Cantankerousnesses refers to the quality of being bad-tempered, irritable, and quarrelsome. Some antonyms that can be used to describe the opposite of cantankerousnesses would be agreeable, pleasant, accommodating, amiable, friendly, and affable. An agreeable person is known to be easy to get along with and is willing to agree or comply with others. A pleasant person is friendly and enjoyable to be around. An accommodating person is willing to adjust or adapt to the needs of others. An amiable person is friendly and sociable. In contrast, a cantankerous person is someone who is difficult to get along with, often critical, and argumentative.