: the ability to think and behave in a reasonable way and to make good decisions
You really should go to see a doctor if your leg hurts that much. It's just common sense!
Obey the laws and use common sense when operating your boat.
She's very smart but she doesn't have a lot of common sense.
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“Common sense.” Merriam-Webster.com Simple Definition, Merriam-Webster, https://www.merriam-webster.com/simple/common%20sense. Accessed 24 Jun. 2026.
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