speak with (an air of) finality
きっぱり言う
speak with a curious mixture of irritation and kindness
いらだちと親切心が奇妙に混じり合った話し方をする
speak with a forked tongue
二枚舌を使う
speak with a lisp
舌足らずの発音をする
speak with complete calm
落ち着き払って話す
speak with constraint
気がねしながら話す
speak with conviction
確信をもって話す
speak with fluency
流暢に話す
speak with gravity
まじめに話す
speak with great intensity
とても熱心に話す