Fetching details from the dictionary...
tone (of voice); parlance; style
intonation; accent
父は厳しい語調で私を叱った。
My father scolded me in a stern tone.
先生は優しい語調で生徒を励ました。
The teacher encouraged the student with a gentle tone.
彼は語調を強め、自分の意見をはっきり述べた。
He strengthened his tone and clearly stated his opinion.