1. Na-adjective (keiyodoshi), Noun

   1.

   tedious; boring; dull; uninteresting

2. Suru verb, Intransitive verb

   2.

   to feel bored; to get bored (with); to get tired (of)

3. Wikipedia definition

   3.

   Boredom

Example sentences

• 退屈で死にそう。

  I'm bored to death.

• 実は、退屈なんだ。

  To tell you the truth, I'm bored.