adj.冷漠的，无动于衷的，不动声色的，无表情的

The observer remained impassive as the performance unfolded before his eyes.
观察者在眼前表演进行时保持冷漠不为所动。
She listened to the news of her friend's engagement with an impassive expression.
她听到朋友订婚的消息时，脸上保持着无动于衷的表情。
His face was an impassive mask, hiding his true feelings.
他的脸庞如同一块无表情的面具，隐藏了他的真实情感。
Despite the chaos around him, the detective maintained an impassive composure.
警探尽管身处混乱，仍保持着冷静的漠然。
The robot's mechanical movements were utterly impassive, reflecting no emotion.
机器人的机械动作完全无动于衷，不显露出任何情绪。
She watched the storm rage outside, her demeanor remaining impressively impassive.
她望着窗外的暴风雨，神情镇定得令人难以置信。
The judge gave a verdict without any hint of emotion, appearing completely impassive.
法官宣判时没有丝毫情绪流露，显得非常冷漠。
He maintained an impassive facade during the heated argument, refusing to show any weakness.
在激烈的争论中，他保持着一副无动于衷的面孔，不露任何破绽。
The archaeologist's study of ancient artifacts was marked by a deep and unchanging impassivity.
考古学家研究古代文物时，始终保持着深沉且不变的冷漠态度。
The experienced poker player's face was always an impassive poker when it came to reading opponents' cards.
在读对手牌时，这位经验丰富的扑克玩家总是面无表情，看不出任何端倪。