noun
calm mind; placid temperament
Refers to a state of inner peace or a composed, untroubled disposition. Often used in literary or reflective contexts.
彼はいつも静心で、慌てることがない。
He always has a calm mind and never panics.
静心を保つために、毎朝瞑想している。
To maintain a placid temperament, I meditate every morning.
冷静 is a more common word for 'calm, composed' and can be used as an adjective (冷静な) or noun, while 静心 is a less common, more literary noun specifically referring to a calm mind or temperament.
落ち着き refers to composure or presence of mind, often in behavior, while 静心 emphasizes an inner, tranquil state of mind.
Compound of 静 (shizu, 'quiet, calm') and 心 (kokoro, 'heart, mind'), with rendaku voicing of the second element to -gokoro. The reading しずこころ is a less common variant without rendaku.