This is the 3609th most frequent Russian word.
сомнение
Doubt or hesitation in believing something.
The word 'сомнений' is used in the plural genitive case due to the negation, indicating the absence of doubt.
У меня нет сомнений в его честности.
I have no doubts about his honesty.
The word 'Сомнение' is used here in the singular nominative case as the subject, reflecting an abstract feeling of uncertainty.
Сомнение терзало меня, пока я не получил подтверждение.
Doubt tormented me until I received confirmation.
The word 'сомнения' is in the singular genitive case following 'от', which indicates the source or reason of trembling.