Placid means calm, peaceful, and undisturbed. A placid lake on a windless morning lies perfectly still, its surface smooth as glass, reflecting the sky like a mirror. A placid person stays composed and even-tempered, not easily upset or excited by what happens around them.

The word describes an absence of trouble or agitation. While your friend might panic during a pop quiz, a more placid classmate stays relaxed and focused. A placid horse remains gentle and steady even when startled, while a skittish one jumps at every noise.

Placid often suggests something naturally peaceful rather than forced. A genuinely placid temperament comes from inner calm, not from hiding feelings. Picture a pond in the woods: no wind stirs its surface, no boats disturb the water. That stillness captures what placid means.

You might describe a baby's placid expression during sleep, a placid afternoon with nothing urgent to do, or a placid neighborhood where life moves slowly and predictably. The word carries a sense of pleasant tranquility, though sometimes too placid can mean boring or lacking energy. But generally, placid describes the kind of peacefulness that feels restful and comfortable.