This is the 15763rd most frequent Russian word.
провальным
The Russian word "провальным" means "failed" or "unsuccessful."
In this sentence, 'провальным' is used as an adjective describing the noun 'выступление', indicating the unsuccessful or failed nature of his performance.
Его последнее выступление было провальным.
His last performance was a failure.
Here, 'провальным' refers to the project, conveying its unsuccessful outcome, attributed to external reasons disclosed in the sentence.
Этот проект оказался провальным из-за плохой организации.
This project turned out to be a failure due to poor organization.
In this context, 'провальных' is used in plural form to describe 'решений', emphasizing her intention to avoid making decisions that could lead to failure.