invariable

英 [?n've?r??b(?)l] 美[?n'v?r?r??bl]
  • adj. 不變的；常數(shù)的
  • n. 常數(shù)；不變的東西

英英釋意

1. not liable to or capable of change;
"an invariable temperature"
"an invariable rule"
"his invariable courtesy"