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Hmm vs. Umm

Hmm and Umm Definitions

Hmm

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.

Umm

Used to express doubt or uncertainty or to fill a pause when hesitating in speaking.

Hmm

A demand for an answer to a question.
Just where were you until 2 a.m.? Hmm?

Umm

Implying hesitation.
- How does a plane fly?
- Umm, I don't know.

Hmm

(intransitive) To make a thoughtful humming noise.

Umm

To make the umm sound to express confusion or hesitancy.
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