also: しずごころなし
ku-adjective (archaic)
Archaic 'ku' adjective describing a state of mental unrest or inability to stay calm. Not used in modern Japanese; found in classical literature.
In classical texts, '静心無し' was written to express a state of unease or restlessness.
Archaic kanji spelling; the word is rarely used in modern Japanese.
Alternate reading with rendaku; also archaic.
Compound of 静 (shizu, 'quiet') + 心 (kokoro, 'heart/mind') + 無し (nashi, 'without'). The exact historical derivation is uncertain, but the word literally means 'without a quiet heart'.