Synonyms of well-nigh in English:

well-nigh


See definition of well-nigh

adverb

1‘policing the coastline all the time was well-nigh impossible’

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