This is the 438th most frequent Japanese word.
間違い
Mistake.
Here '間違い' refers to an error or mistake made by a person.
彼の間違いは簡単に修正できました。
His mistake was easily corrected.
Here, '間違いなく' means 'without a doubt,' showing a figurative use of '間違い' to indicate certainty.
そんなことをしたら間違いなく問題になる。
Doing such a thing will undoubtedly lead to problems.
In this sentence, '間違い' is used to denote an error or inaccuracy present in a certain statement or object.