Collocations for eccentric - adj.

be, look, seem
become, get
The old lady was getting very eccentric.

consider sb, find sb, regard sb as
We were definitely regarded as eccentric.

extremely, fairly, very, etc.
highly, wildly (esp. BrE)
a little, slightly, etc.
mildly
endearingly (esp. BrE)
his endearingly eccentric nature spilling into his speech

increasingly
In his last years, he became increasingly eccentric.

Eccentric is used with these nouns:
genius, habit, orbit, professor, taste, uncle