suffixes - in-able ? un-able?


Suffix -able adds meaning "being able" to a word. I know that.


Prefix in- and un- mean "not" or some negative meaning. I know that.


However, when it comes to mixing of these, I am confused.



  • unbelievable

  • indispensable


In the dictionary I can find many words of these forms, let's call them in-able and un-able, whose composing rule seems just random to me.


When given a certain word body, how can I make an in-able or un-able word to mean "not being able"?




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