crotchety expression

東野圭吾の小説の "Silent Parade" を読んでいます。

When he had finished reading the statement, Director Mamiya looked up at Kusanagi. The crotchety expression on his face turned into a smile as he dropped the document onto his desk, "Good job."

"crotchety expression" はどんな表現でしょうか？　辞書を見ます。

・Oxford English Dictionary: easily upset; angry: He was tired and crotchety.
・Collins Dictionary: A crotchety person is bad-tempered and easily irritated.: ...my cross, crotchety neighbours.
・Cambridge English Dictionary: often in a bad mood and easily annoyed: By the time the meal began, the youngest children were getting tired and crotchety.