The adjective 得意 (meaning "good at/skilled in", JLPT N3) conjugates in the Past Negative Casual form as 得意じゃなかった (tokui janakatta). Adjective type: na-adjective.
Context Example
英語が得意じゃなかった。
Eigo ga tokui janakatta.
I did not like English.
What is the Past Negative Casual conjugation of 得意 (tokui)?
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