The adjective 面白い (meaning "interesting/funny", JLPT N5) conjugates in the Negative Polite form as 面白くないです (omoshirokunai desu). Adjective type: i-adjective.
Context Example
その本は面白くないです。
Sono hon wa omoshirokunai desu.
That book is not interesting.
What is the Negative Polite conjugation of 面白い (omoshiroi)?
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