Related words なんとなく なんとなく is more about doing something without a clear reason or just because, while 心なしか focuses on a vague perception or impression.
気き のせいか 気のせいか explicitly suggests it might be one's imagination, whereas 心なしか is softer and simply notes a subtle feeling.
Written forms 心こころ なしか
Standard kanji-kana mixed spelling.
心こころ 成な しか
rarely-used kanji form
Rarely used kanji form; the kanji 成 suggests 'become' or 'turn out'.
心こころ 做な しか
rarely-used kanji form
Rarely used kanji form; the kanji 做 means 'do' or 'make'.
Etymology Formed from 心做し , “one’s impression or feeling,” and the particle か . The phrase presents something as a subjective or uncertain impression.
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