/ˈɡrʌmpinəs/
She was in a bad mood and her grumpiness was affecting everyone around her.
彼女は気分が悪く、彼女の不機嫌さが周囲の全員に影響を与えていた。
He was known for his grumpiness and never seemed to be happy.
彼は不機嫌で知られ、幸せそうに見えることは一度もありませんでした。