な-Adj (stem) + 極まりない / 極まる

[Extremely / To the utmost degree]

Connection: な-Adjective stem + 極まりない / 極まる

Usage: Expresses that something is at an extreme degree. 極まりない (boundlessly X) and 極まる (reaches the extreme of X) are nearly synonymous. Formal/written expression. Often used with negative-connotation adjectives.

Variations:

• 極まりない: 危険極まりない (extremely dangerous)
• 極まる: 感極まる (overcome with emotion)

Examples:

彼の態度は失礼極まりない。(His attitude is extremely rude.)

そんな行為は危険極まりない。(Such behavior is extremely dangerous.)

彼女は感極まって涙を流した。(She was so overcome with emotion that she shed tears.)