The adjective 明るい (meaning "bright/cheerful", JLPT N4) conjugates in the Past Negative Casual form as 明るくなかった (akarukunakatta). Adjective type: i-adjective.
Context Example
教室が明るくなかった。
Kyoushitsu ga akarukunakatta.
The classroom was not bright.
What is the Past Negative Casual conjugation of 明るい (akarui)?
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