reduced to or fallen into partial ruin or decay, as from age, wear, or neglect.

1800–10; dilapidate + -ed2

nondilapidated, adjective
undilapidated, adjective

run-down, tumbledown, ramshackle, rickety.
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verb (used with object), dilapidated, dilapidating.
to cause or allow (a building, automobile, etc.) to fall into a state of disrepair, as by misuse or neglect (often used passively): The house had been dilapidated by neglect.
Archaic. to squander; waste.
verb (used without object), dilapidated, dilapidating.
to fall into ruin or decay.

1560–70; < Medieval Latin dīlapidātus, past participle of dīlapidāre to squander (compare dīlapidātiō disrepair), Latin: to pelt with stones; see di-2, lapidate

dilapidation, noun
dilapidator, noun
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Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
dilapidate (dɪˈlæpɪˌdeɪt)
to fall or cause to fall into ruin or decay
[C16: from Latin dīlapidāre to scatter, waste, from dis- apart + lapidāre to stone, throw stones, from lapis stone]

dilapidated (dɪˈlæpɪˌdeɪtɪd)
falling to pieces or in a state of disrepair; shabby

Collins English Dictionary - Complete & Unabridged 10th Edition
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Word Origin & History

1806, pp. adj. from dilapidate.

1560s, from L. dilapidare, originally "to throw stones;" see dilapidation.
Online Etymology Dictionary, © 2010 Douglas Harper
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Example sentences
Later years brought decline, as some districts became dilapidated domains of
  drug dealers and street people.
The slums were razed and dilapidated housing was replaced by high- income
  private housing and low income public housing.
The photographs, a mix of street scenes and interiors, show color-saturated
  stucco storefronts and dilapidated courtyards.
Moreover, despite his dilapidated garb and unkempt hair, he maintains a role of
  quiet authority.
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