flaw

The word “flaw” means a defect or imperfection, often one that is hidden or not obvious at first. In plain terms, a weakness or defect in something, whether physical, like a crack, or abstract, like a plan or argument.

“Flaw” is pronounced flaw (/flɔ/ in IPA).

Here is “flaw” used in a sentence: “The diamond had a small flaw visible only under magnification.”

“Flaw” is a noun.

The word “flaw” comes from Middle English. From Middle English flawe, probably from Old Norse flaga ("a flake" or "slab of stone").

“Flaw” is an uncommon word in modern English, usually learned at around the B2 level.

A flaw is usually an inherent imperfection or weakness in something's design, character, or material, while a mistake is a specific error made in an action or decision. A flaw can exist without anyone doing anything wrong, whereas a mistake implies an action that went wrong.

The two words overlap closely, but "flaw" often suggests a hidden or subtle defect that isn't obvious at first glance, while "fault" can be more visible and also carries a sense of blame, as in "it's not my fault." Both describe imperfections, but "fault" more commonly implies responsibility.

Yes, "flaw" is commonly used for abstract things like arguments, plans, and personalities, such as "a flaw in the logic" or "a character flaw." It applies just as naturally to conceptual weaknesses as to physical defects.