[ uhn-der-mahynd or, especially for 1, 2, uhn-der-mahynd ]
/ ˌʌn dərˈmaɪnd or, especially for 1, 2, ˈʌn dərˌmaɪnd /
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attacked, weakened, or defeated by underhand or seemingly harmless actions or by imperceptible stages:Both the struggling students and the most gifted ones are receiving limited support from an undermined educational system.
weakened or made to collapse by removing underlying support, as by eroding or digging away the foundation:With the release of material from the undermined cliffs at these sites, we should have had far more sand to feed the beaches, not less.
deliberately weakened by an excavation or tunnel dug underneath, as by an enemy in war:When the town was besieged, its defenders abandoned the undermined walls and retired into the citadel.
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Origin of undermined

Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2022

How to use undermined in a sentence