Can't rightly tell

Meaning

This means you are not entirely sure about something. It suggests you have some information, but you are hesitant to give a definitive answer.

Cautious, polite

Used in a sentence

• Do you think it will rain today? I can't rightly tell, the clouds look pretty strange.
• How long will it take to drive there? I can't rightly tell with all this traffic.
• Do you know which way he went? I can't rightly tell, he moved pretty fast.