adv. 25B6; adverb
we will investigate all complaints thoroughly : RIGOROUSLY, in depth, exhaustively, from top to bottom, minutely, closely, in detail, meticulously, scrupulously, assiduously, conscientiously, painstakingly, methodically, carefully, comprehensively, fully.
she is thoroughly spoilt : UTTERLY, downright, absolutely, completely, totally, entirely, really, perfectly, positively, in every respect, through and through; informal plain, clean.