impregnable /im-pregˈnə-bl/

1. That cannot be captured, broken into or taken by force
2. Which cannot be overcome, unassailable

impregnabilˈity noun

impregˈnably adverb

• tiddlers
• tiddles
• tiddley
• tiddleys
• tiddlier
• tiddlies
• tiddliest
• tiddling
• tiddly
• tiddlywink
• tiddlywinks
• tiddy
• tide
• tided
• tide gate
• tide gates
• tide gauge
• tide gauges
• tideland
• tidelands
• tideless
• tide lock
• tide locks
• tidemark
• tidemarks