painstaking◼◼◼(careful attentive; diligent) adjective [UK: ˈpeɪnz.teɪkɪŋ] [US: ˈpeɪn.ˌstekɪŋ]Vaccines typically take years of painstaking research to develop. = La mise au point d'un vaccin nécessite généralement des années de recherche minutieuse.
minutieusement adverbe
meticulously◼◼◼adverb [UK: mɪ.ˈtɪ.kjʊ.lə.sli] [US: mə.ˈtɪ.kjə.lə.sli]The stone carver meticulously carved intricate patterns on the monument. = Le tailleur de pierre a minutieusement sculpté des motifs complexes sur le monument.
painstakingly◼◼◼(in a painstaking manner; very slowly and carefully) adverb [UK: ˈpeɪnz.teɪk.ɪŋ.li] [US: ˈpeɪn.ˌstek.ɪŋ.li]He did his work painstakingly. = Il a fait son travail minutieusement.