Artificial intelligent assistant

water-fast

ˈwater-fast, a. Sc.
  = watertight.

1550 Abstr. Protocols Town Clerks Glasgow (1894) I. 19 To keip the bwyth wattir fast with haile tymmyr, lofting, and flure. a 1568 Satir. Poems Reform. xlvi. 16 To pomp als oft as ȝe may haill, Ȝeill nevir hald hir watter-fast. 1574 Burgh Rec. Glasgow (1876) 20 For helping to repair the said kirk and haldyng of it wattirfast. 1898 E. W. Hamilton Mawkin of Flow xviii. 254 The shieling's well biggit and as waterfast as a sowen-tub.

Oxford English Dictionary

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