Article unbelievable in any way (2,3)
I believe the answer is:
at all
'in any way' is the definition.
(synonyms)
'article unbelievable' is the wordplay.
'article' becomes 'a' (the indefinite article in English).
'unbelievable' becomes 'tall' (e.g. 'a tall story').
'a'+'tall'='AT ALL'
(Other definitions for at all that I've seen before include "Whatsoever" , "in any circumstances" , "in any way" .)