Incorrect is a related term of unsuitable.
As adjectives the difference between incorrect and unsuitable
is that incorrect
is not correct; erroneous or wrong while unsuitable
is not suitable; unfit; inappropriate.
Not correct; erroneous or wrong.
* He gave an incorrect answer to a simple question
Faulty or defective.
* The PC crashed due to incorrect programming
Inappropriate or improper.
* He was sacked because of his incorrect behaviour towards his secretary
Not suitable; unfit; inappropriate.