Entry Word: perfectly

Function: adverb

Meaning: 1 without any flaws or errors <you did that handspring perfectly on your first try>

Synonyms faultlessly, flawlessly, ideally, impeccably

Related Words excellently, fabulously, finely, grandly, greatly, marvelously, superbly, superiorly, superlatively, terrifically; exceptionally, fancily, specially

Phrases to a nicety, to a T, to a turn

Near Antonyms deficiently, inadequately, incompletely, insufficiently; fallibly; atrociously, execrably, wretchedly

Antonyms badly, defectively, faultily, imperfectly

2 to a full extent or degree <you know perfectly well what Iʼm talking about, so donʼt pretend> — see fully 1