This is the 16929th most frequent Russian word.
сомневается
"Doubts" or "is uncertain."
Here, 'сомневается' is used to indicate that Anna has doubts or lacks confidence in her own abilities.
Анна сомневается в своих силах.
Anna doubts her abilities.
In this sentence, 'сомневается' is used to express skepticism or doubt about the quality of an idea.
Он сомневается, что это хорошая идея.
He doubts that it's a good idea.
Here, 'сомневаемся' (we doubt) is the plural form, highlighting the shared uncertainty of a group regarding someone's punctuality.