na-adjective
loud-voiced; in a loud voice
Describes speaking or shouting in a conspicuously loud voice, often with a nuance of being overly assertive or indiscreet. Commonly used as 声高に + verb.
彼は会議で声高に反対意見を述べた。
He voiced his objection loudly at the meeting.
酔っ払いが声高に
A drunk person is singing in a loud voice.