Synonyms of nigh on in English:

nigh on

See definition of nigh


1‘highlights are nigh-on impossible to pick out’

well-nigh, almost, nearly, just about, more or less, practically, virtually, all but, as good as, next to, close to, near, to all intents and purposes, approaching, bordering on, verging on, nearing, about
roughly, approximately
not quite
informal pretty nearly, pretty much, pretty well