WordReference Random House Learner's Dictionary of American English © 2014
ˈwell-ˈnigh,  adv. 

    very nearly;
    almost:having been there well-nigh twenty years.


Collins Concise English Dictionary © HarperCollins Publishers::

well-nigh adv
  1. nearly; almost: it's well-nigh three o'clock



'well-nigh' also found in these entries:
In the English description:

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