Hmm vs. Umm
Hmm and Umm Definitions
Indicating thinking or pondering.
Hmm... that's an interesting idea.
Hmm... I just can't decide between the two.
Hmm... creation or evolution? That’s the big question.
Used to express doubt or uncertainty or to fill a pause when hesitating in speaking.
A demand for an answer to a question.
Just where were you until 2 a.m.? Hmm?
- How does a plane fly?
- Umm, I don't know.
(intransitive) To make a thoughtful humming noise.
To make the umm sound to express confusion or hesitancy.