no doubt in someone's mind
idiom
: no uncertainty felt by someone (about something)
There's absolutely no doubt in her mind about his guilt.
Cite this Entry
“No doubt in someone's mind.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/no%20doubt%20in%20someone%27s%20mind. Accessed 2 Dec. 2025.
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Merriam-Webster unabridged
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