Crossword puzzle clue "impregnable"

Here are the possible solutions for impregnable clue

Answer
Clue
Relevancy
gibraltar
Clue
Impregnable stronghold
ideas
Clue
"Gibraltar may be strong, but ___ are impregnable": Emerson
Definition
IDEA, a conception or a plan
immune
Clue
Impregnable
Definition
exempt from; resistant to disease
ivory
Clue
Impregnable tower
Definition
of a white colour

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