1. calm and peaceful; not easily upset or excited
2. having a smooth, undisturbed surface
Usage: often used to describe water

Examples

• The placid lake reflected the mountains perfectly.
• Despite the chaos around her, she remained placid and composed.
• The baby had a placid temperament and rarely cried.
• We enjoyed a peaceful afternoon by the placid pond.
• His placid expression never revealed his true feelings.
• The placid waters made it perfect for canoeing.
• She spoke in a placid voice that calmed everyone down.