Off colour Definition 1 of 3Pro Tip 1/3Subtle Discomfort Used when someone isn't very sick, but doesn't feel 100% well. It's subtle, not severe. I think I'll skip the gym today—I'm a bit off colour. Pro Tip 2/3Not Depressed Doesn't mean very sad or depressed, but having a slightly low mood. Sorry for the low energy today, I'm feeling off colour. Pro Tip 3/3Temporary State Implies a temporary condition, not a long-term feeling or illness. I've been a bit off colour since yesterday, but I should be fine by tomorrow.