Note: in AM, use 'off-color'
1.
If you say that you are feeling off-colour, you mean that you are slightly ill. (BRIT)
For three weeks Maurice felt off-colour but did not have any dramatic symptoms.
= out of sorts
ADJ: v-link ADJ
2.
If you say that someone's performance is off-colour, you mean that they are not performing as well as they usually do. (BRIT JOURNALISM)
Milan looked off-colour but eventually took the lead in the 82nd minute.
ADJ