impregnableadjective
uk/ɪmˈpreɡ.nə.bəl/us/ɪmˈpreɡ.nə.bəl/A building or other place that is impregnable is so strongly built and/or defended that it cannot be entered by force:
Despite burglar alarms and window locks, homes are never impregnable against determined thieves.
mainly UK powerful and impossible to beat, especially in sport:
Surrey have been building up an impregnable lead in this season's County Championship.
Thesaurus: synonyms and related words
Safe and secure
- as safe as houses idiom
- bite
- coast
- copper-bottomed
- fail-safe
- firmly
- friendly
- immune
- innocent
- innocuous
- inoffensive
- inviolate
- kind
- ozone-friendly
- safety net
- sb/sth won't bite idiom
- seaworthy
- securely
- sheltered
- the coast is clear idiom
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Physically strong and powerful