Synonyms:
unassailable, unshakable, watertight, bulletproof
Meaning: without flaws or loopholes; "an ironclad contract"; "a watertight alibi"; "a bulletproof argument"
Synonyms:
watertight
Meaning: not allowing water to pass in or out
Usage examples
It was a mere shell of blackened steel, with a collapsible roof that, when in position, made the submarine watertight, but at present the roof rested in slots on either side of the magic craft.
A sand pile, or a large, shallow sand box, perhaps five feet square, with sides six inches high, and completely lined with enamel cloth to make it watertight, is a wonderful implement for constructive play on the part of the child. Whole villages of farms, fields, and forests, ponds and brooks, roads and railroads, can be made here in miniature.