adj. 1. Impossible to capture or enter by force: an impregnable fortress. 2. Difficult or impossible to attack, challenge, or refute with success: an impregnable argument. [Middle English imprenable, from Old French : in-, not (from Latin in-; see IN-1) + prenable, pregnauble, pregnable; see PREGNABLE.] im·pregna·bly adv. |
The American Heritage® Dictionary of the English Language, Fifth Edition copyright ©2022 by HarperCollins Publishers. All rights reserved.
adj. Capable of being impregnated. [IMPREGN(ATE) + -ABLE.] |
The American Heritage® Dictionary of the English Language, Fifth Edition copyright ©2022 by HarperCollins Publishers. All rights reserved.