Ko
(
コ
)
tsu
(
ツ
)
Ko
(
コ
)
tsu
(
ツ
)
App Store
Google Play
Vocabulary
Non-JLPT
Day 48
任意
New
任意
任意
にんい
optional, voluntary, arbitrary
noun
Sino-Japanese
Lv.5
Again
1
Hard
2
Good
3
Easy
4
Previous word
Space flip · 1–4 grade · ← → move
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