好不 and seemingly contradictory dictionary definitions

Pleco's ABC extension gives 好不 two seemingly contradictory definitions with two seemingly directly contradictory examples, yet no usage notes:

1. Not at all 好不容易 = Have a hard time

2. utterly; extremely 好不快活 = extremely happy.

Most of you should be well aware that 容易is easy, so the example with 1 is, using the given definition, "not at all easy".

How do you know when 好不快活 means extremely happy and when 好不快活 means not at all happy?

submitted by /u/GuoJing22
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