JMdict: 1188810

何時しか 【いつしか】

  1. [adv] before one knows; unnoticed; unawares
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Kanji in this word:

Kanji Meanings On Readings Kun Readings Grade
What なに, なん, なに-, なん- 2
Time, Hour とき, -どき 2

Words often seen with this one: (experimental feature)

こと (20), その (18), そして (17),  (15), そんな (15), この (14), という (11), 自分 (10)