Translation guide
The state of feeling bored, weary, or uninterested due to lack of stimulation or engagement.
Expressing a general feeling of boredom or lack of interest.
The most common and neutral word for boredom. Can be used as a noun or na-adjective.
I'm so bored I could die.
This movie was boring.
A more formal or literary term for boredom, often implying weariness or lassitude.
Literally 'to have too much free time on one's hands', implying boredom from lack of things to do.
A rare, literary term for boredom or ennui.
Boredom caused by repetitive or unchanging situations.
Boredom stemming from lack of interest in something specific.
退屈 (taikutsu) is a noun/na-adjective for the state of boredom, while つまらない (tsumaranai) is an i-adjective describing something as boring. Use 退屈 for 'I'm bored' and つまらない for 'It's boring'.
This book is boring.
English 'boredom' is often expressed with adjectives or verbs in Japanese. Using the noun 退屈 is fine, but phrases like 退屈を感じる (to feel boredom) can sound stiff. More natural: 退屈している (I am bored).
Boredom is a terrible feeling.
I can't stand this boredom.
倦怠感に襲われる。
I'm overcome with a feeling of boredom/weariness.
I'm bored during summer vacation with nothing to do.
To complain of boredom.
この関係もマンネリ化してきた。
This relationship has become boring/routine.
This game is boring.