hmm

Hmm is defined as a sound you make to express hesitation or when you are thinking about something or don't know exactly what to say.

(interjection)

An example of hmm is what you say when someone asks you a tough question and you pause for a second before answering.

See hmm in Webster's New World College Dictionary

or hm

interjection

hem: used to signify hesitation, a question, thoughtful consideration of another person's statement, etc.

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hmm in a sentence

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