'[consistently-kept]' originates from '[English]', specifically the words '[consistent]' and '[keep]', where '[consistent]' meant '[unchanging]' and '[keep]' meant '[maintain]'.

'[consistently-kept]' is a modern English compound adjective formed by combining '[consistent]' and '[kept]'.

Initially, it meant '[maintained in a consistent manner]', and this meaning has largely remained the same in modern usage.