adverb

to a notable degree; very.

an eminently readable textbook

very,most,greatly,highly,exceedingly,extremely,particularly,positively,exceptionally,supremely,remarkably,uniquely,obviously,clearly,conspicuously,markedly,singularly,signally,outstandingly,strikingly,notably,prominently,surpassingly,totally,completely,utterly,absolutely,thoroughly,perfectly,downright,par excellence