This is the 18246th most frequent Russian word.
чреват
Fraught with; likely to result in (something undesirable).
In this sentence, 'чревата' indicates that the mistake inherently carries potential serious consequences. It shows the possible problematic outcomes associated with an action.
Эта ошибка чревата серьёзными последствиями.
This mistake is fraught with serious consequences.
Here, 'чревато' reflects that the decision led to the realization of many difficulties as a result.
Решение участвовать в проекте оказалось чревато многочисленными трудностями.
The decision to participate in the project turned out to be fraught with numerous difficulties.
In this example, 'чревата' conveys that the improperly done work inherently may result in increased costs, suggesting potential negative outcomes.