-
Hmm (interjection)
Indicating thinking or pondering.
“Hmm… that’s an interesting idea.”
“Hmm… I just can’t decide between the two.”
-
Hmm (interjection)
A demand for an answer to a question.
“Just where were you until 2 a.m.? Hmm?”
-
Hmm (verb)
To make a thoughtful humming noise.
-
Umm (interjection)
Interjection implying hesitation; see um.
“- How does a plane fly?”
“- Umm, I don’t know.”
-
Umm (verb)
To make the umm sound to express confusion or hesitancy.
Wiktionary
-
Hmm (interjection)
used to express reflection, uncertainty, or hesitation
“hmm, interesting idea”
“hmm, well I should probably get going”
“A coincidence? Hmm”
Oxford Dictionary