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OAT→ill-defined

ill-defined

Flag: gbEnglishOxford American Thesaurus
ill-defined
adjective
the boundary between the two manors was rather ill-defined:
vague, indistinct, unclear, imprecise, inexplicit;
blurry, blurred, fuzzy, hazy, woolly, nebulous, shadowy, dim.
▷antonyms well defined, sharp.