Boring
Boredom, Tedious
noun, verbal noun, な adjective
I retreat! I yield! I can't take it anymore, it's so boring. Just imagine yourself giving up on whatever you're doing because you're so darn bored. You can't stand it. You have to retreat. You are ready to yield. Booooooring.
This is a jukugo word, which usually means on'yomi readings from the kanji. If you know the readings of your kanji you'll know how to read this as well.
果てしなく続く空の下で、生徒たちは果てしなく長くて退屈な校長の話を聞かなくてはならなかった。
Beneath the endless sky, students had to listen to the principal’s endless and boring speech.