noun, na-adjective
unparalleled robustness; exceptionally robust health
Emphatic expression meaning 'so robust that nothing compares'. Often used to describe a person's physical constitution or, by extension, the sturdiness of systems or objects.
祖父は頑健無比で、90歳になっても毎日散歩を欠かさない。
My grandfather is of unparalleled robustness; even at 90, he never misses his daily walk.
この金庫は頑健無比な構造で、どんな工具でも破れない。
This safe has an exceptionally robust construction and cannot be broken by any tool.
Compound of 頑健 (robust, sturdy) and 無比 (unparalleled, matchless). The exact historical derivation is uncertain, but the word is formed from standard Sino-Japanese morphemes.