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основательный meaning in English

RussianEnglish
основательный adjective

profound [profounder, profoundest](intellectually deep)
adjective
[UK: prə.ˈfaʊnd] [US: proˈfaʊnd]

thorough(detailed)
adjective
[UK: ˈθʌ.rə] [US: ˈθɝːo.ʊ]

безосновательный adjective

unfounded(not based on solid reasons or facts)
adjective
[UK: ˌʌn.ˈfaʊn.dɪd] [US: ən.ˈfaʊn.dəd]