be off-colour

(British & Australian) also be off-color (American & Australian)

to not be feeling as well as usual He had flu a couple of months ago and he's been a bit off-colour ever since.

Name	Pronounced	Usage
Vega	-	Astronomy
TristÁN	tree-STAHN	Spanish
Forrest	['fɔ:rist]
Annett	['ænit]
Au&Eth;Rhildr	-	Ancient Scandinavian
Iapheth	-	Biblical Greek