I will taunt about adult being uncomfortable (3,2,4)
I believe the answer is:
ill at ease
'uncomfortable' is the definition.
('ill at ease' can be a synonym of 'uncomfortable')
'i will taunt about adult' is the wordplay.
'i will' becomes 'ill' (I've seen this before).
'taunt' becomes 'tease' ('tease' can be a synonym of 'taunt'**).
'about' is a charade indicator (letters next to each other).
'adult' becomes 'a'.
'tease' put after 'a' is 'atease'.
'ill'+'atease'='ILL AT EASE'
'being' acts as a link.
(Other definitions for ill at ease that I've seen before include "Nervous, uncomfortable" , "wound up" , "Elite, alas? (Anag)" , "Unsure and constrained in manner" , "awkward" .)