DictionaryflawDefect or weakness
noun / verb

flaw

FLAW/flɔː/

An imperfection, or to make imperfect.

The bowl has a visible flaw where its rim is chipped.

A single otherwise well-made ceramic bowl has a conspicuous chipped rim and a short crack extending down its side, making its imperfection immediately visible.
Etymology

Old Norse flaga meant a stone slab or layer, perhaps extended to a flake or splinter. “Defect” probably developed through the idea of a fragment broken off.

In context

Whispers of History26:07
Each new collapse revealed a previously unknown weakness, a hidden flaw in their design logic.
How EARLY Builders Formed Earthquake-Resistant Design With Primitive Tools

More examples

  • The biggest flaw in our plan is its cost.
  • The novel's hero admits his flaws and tries to change.
  • Engineers found a security flaw in the payment software.
  • The report is flawed by several factual errors.

Forms

flaw · flaws · flawed · flawing

flawless adjective — without any defects or mistakes

Similar words

defect
Often suggests a problem that prevents something from working properly.
imperfection
Often suggests a small shortcoming rather than a serious weakness.
blemish
Usually refers to a mark that spoils a surface's appearance.