YOU SAID:

my sisters are so annoying

INTO JAPANESE

私の姉妹はとても迷惑です

BACK INTO ENGLISH

My sisters are very annoying

INTO JAPANESE

私の姉妹は非常に迷惑です

BACK INTO ENGLISH

My sister is very annoying

INTO JAPANESE

妹はとてもうるさい

BACK INTO ENGLISH

My sister is very noisy

INTO JAPANESE

妹はとてもうるさい

BACK INTO ENGLISH

My sister is very noisy