Grammar fix
a fundamental flaw
basic defect
a very basic or central weakness or problem in something, especially one that affects its whole structure or purpose.
collocationC1occasional
Hear it in context
Notice where the phrase sounds natural.
There is a fundamental flaw in the way the new system processes data.
In my opinion, the proposal has a fundamental flaw because it doesn't consider the needs of people living in rural areas.
Fix the pattern
One small grammar move makes it sound right.
Not: The argument has a fundamental flaw on it.
Say: The argument has a fundamental flaw in it.
'A flaw IN something', not 'on'.
Which sounds natural?
Tap the one a native speaker would say.
'Possesses a flaw' for an abstract thing sounds bookish; natives say 'there's a flaw in'.
Build natural chunks
Words that usually travel with it.
a fundamental flaw in
- the argument
- the design
- the logic
- the system