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Từ điển WordNet v3.1 - WordNet Dictionary
impregnable


adjective
1. immune to attack;
incapable of being tampered with (Freq. 1)
- an impregnable fortress
- fortifications that made the frontier inviolable
- a secure telephone connection
Syn:
inviolable, secure, strong, unassailable, unattackable
Similar to:
invulnerable
Derivationally related forms:
impregnability, secureness (for: secure)
2. capable of conceiving
Syn:
conceptive
Similar to:
fertile
Derivationally related forms:
conceive (for: conceptive)
3. incapable of being overcome, challenged or refuted
- an impregnable argument
- impregnable self-confidence
Syn:
inexpugnable
Similar to:
unconquerable

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