Collocations for superficial - adj.

be, seem
remain

extremely, fairly, very, etc.
The movie bears a fairly superficial resemblance to the original novel.

entirely, purely
He began to feel he could cope, on a purely superficial level, at least.

largely

Superficial is used with these nouns:
burn, cut, examination, impression, injury, knowledge, level, likeness, resemblance, similarity, treatment, understanding