Suffix, I-adjective (keiyoushi)
extremely; in the extreme; knows no bounds (e.g. rudeness); unparalleled
suffix often in kana
その机は、乱雑極まりない状態だ。The desk is in a state of total disorder. I-adjective (keiyoushi)
boundless (e.g. universe, ocean); limitless
Also written 窮まりない【きわまりない】