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comparative more impoverished, superlative most impoverished
Reduced to poverty. examples
Having lost a component, an ingredient, a faculty or a feature; rendered poor in something; depleted. quotations examples
[I]t was out of print for 28 years, before an edition (now rare) was published in 1960, impoverished by having all citations removed.
2018, James Lambert, “Setting the Record Straight: An In-depth Examination of Hobson-Jobson”, in International Journal of Lexicography, volume 31, number 4, page 488
simple past and past participle of impoverish examples