This is the 13591st most frequent Russian word.
невнимательности
Lack of attentiveness.
Here, 'невнимательности' is used in the plural form to indicate the concept of inattentiveness or lack of focus, responsible for errors.
Его невнимательности привели к ошибкам в ответах.
His inattentiveness led to mistakes in his answers.
In this sentence, 'невнимательности' is attributed to the speaker, emphasizing personal lack of attention.
Из-за моей невнимательности я забыл забрать документы.
Due to my inattentiveness, I forgot to pick up the documents.
Here, 'невнимательности' refers to the students' collective lack of attention during the class.