How do you usually turn down an invitation when you don't feel like going?

A natural way to answer

I prefer to be polite and clear. I usually thank them for the invitation, say I'm too tired this time, and suggest meeting another day instead. The important thing is not to leave them hanging, so I always reply promptly.

Key phrases to use

• wiped out — extremely tired; exhausted“I was completely wiped out after the trip.”
• leave someone hanging — to fail to give someone an answer they're waiting for“Just reply, don't leave her hanging.”