extremely; very ~
Describes something as being at the utmost extreme of a quality, often with a negative or intense nuance.
This pattern is used to emphasize that something is extremely or utterly a certain quality. It is quite formal and often carries a strong negative evaluation, such as in 失礼極まる (utterly rude) or 危険極まりない (extremely dangerous). In modern Japanese, 極まる and 極まりない are interchangeable in meaning, but 極まりない is slightly more common in written language and feels a bit more emphatic. Note that the pattern is not used in casual conversation; it belongs to formal writing, speeches, or serious reports. When using it, the adjective stem functions like a noun, so you cannot add だ or な after it before this pattern.