This is the 13632nd most frequent Russian word.
незначительную
"Insignificant" or "minor."
In this sentence, 'незначительную' (minor) is used as an adjective to describe the noun 'ошибка' (mistake), indicating something minor or inconsequential.
Она сделала незначительную ошибку в своем докладе.
She made a minor mistake in her report.
Here, 'незначительную' (minor) modifies the noun 'трещина' (crack), underscoring that the crack is slight and likely unimportant.
После ремонта мы заметили незначительную трещину в стене.
After the renovation, we noticed a minor crack in the wall.
In this example, 'незначительным' (insignificant) is used as an adjective to describe the noun 'вклад' (contribution), suggesting the relative lack of importance in comparison to a broader context.