h'm

or hmm

[ hmm ]
/ hmm /

interjection

(used typically to express thoughtful absorption, hesitation, doubt, or perplexity.)
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British Dictionary definitions for h'm

h'm

/ (spelling pron hmmm) /

interjection

used to indicate hesitation, doubt, assent, pleasure, etc
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012