Unwell and resting, but uncomfortable (3-2-4)
I believe the answer is:
ill-at-ease
'uncomfortable' is the definition.
(being ill at ease is being uncomfortable or uneasy)
'unwell and resting' is the wordplay.
'unwell' becomes 'i'll' (similar in meaning).
'and' says to put letters next to each other.
'resting' becomes 'at ease' (I've seen this before).
'ill'+'atease'='ILL-AT-EASE'
'but' acts as a link.
(Other definitions for ill-at-ease that I've seen before include "Uncomfortable, embarrassed - sick and relaxed" , "Unsettled, anxious" , "Uneasy" , "Uncomfortable with a situation" , "Allies eat while feeling awkward" .)