also: むへんざい
na-adjective, noun
Literary or philosophical term for something without limits or boundaries; rarely used in everyday speech.
彼の想像力は無辺際だ。
His imagination is boundless.
宇宙の無辺際な広がりに思いを馳せる。
I contemplate the infinite expanse of the universe.
Compound of 無 (without) + 辺際 (boundary, limit). The exact historical derivation is uncertain; the word is a literary coinage likely influenced by Buddhist or philosophical texts.