impregnable
UK[ɪmˈpregnəbl̩]US[ɪmˈpregnəbl̩]
adj
(of a fortified position) unable to be captured or broken into.
adj
unable to be defeated or destroyed; unassailable.
Morpheme Breakdown
im
pregn
able
im
not
pregn
take
able
capable of
Etymology
the word "impregnable" entered english in the late 14th century from old french imprenable, itself derived from the latin elements in- (not) and prehendere (to take). the literal sense was "that which cannot be taken or seized," originally describing physical fortifications. the intrusive "g" was added in the 15th century by association with latin-derived english words like "impregnate," though the two words are etymologically distinct. over time, the meaning expanded from the purely physical to describe abstract concepts like arguments or positions that are unassailable and cannot be overcome.
Analysis
Structure: im (not) + pregn (take) + able (capable of)
im: latin, a prefix meaning "not" or "without".
pregn: latin, from the verb prehendere meaning "to take, seize, grasp".
able: latin/french/english, a suffix forming adjectives meaning "capable of, fit for, or worthy of".
Examples
the castle was considered impregnable due to its thick walls and strategic location.
her logic in the debate was so sound that her position seemed impregnable.
the team's defense has been impregnable this season, conceding very few goals.