itself
US /ɪtˈself/
UK /ɪtˈself/

1.
zichzelf
used as the object of a verb or preposition to refer to a thing, animal, or idea previously mentioned
:
•
The cat groomed itself.
De kat verzorgde zichzelf.
•
The door closed by itself.
De deur sloot vanzelf.
2.
zelf
used to emphasize the thing, animal, or idea mentioned
:
•
The city itself is beautiful, but the surrounding areas are not.
De stad zelf is mooi, maar de omliggende gebieden niet.
•
The problem itself is not that difficult.
Het probleem zelf is niet zo moeilijk.