This is the 532nd most frequent Slovenian word.
nobene
"None" or "no" (used to indicate the absence of something).
Here, 'nobene' is used in a phrase to describe that no similar 'slike' (painting) have ever been seen by the subject.
Še nikoli nisem videl nobene podobne slike.
I have never seen a painting like this before.
In this instance, 'nobene' functions as an adjective emphasizing the nonexistence of 'rože' (flowers) in the specified location.
Tukaj ni nobene rože.
There is no flower here.
Here, 'nobene' is used as an adjective to indicate total absence of the noun 'kruha' (bread).