Cantankerous/kænˈtæŋkərəs/ Definition 1 of 1Pro Tip 1/3Negative Connotation Cantankerous implies strong disapproval and shouldn't be used flippantly. The cantankerous landlord scared all the tenants. Pro Tip 2/3Non-Physical Context Use it to describe behavior or personality, not physical objects. During the negotiations, his cantankerous demeanor was off-putting. Pro Tip 3/3Typically Informal Though not slang, 'cantankerous' suits casual or literary speech more than formal writing. The book's cantankerous hero became a fan favorite.