Chary:
cautiously or suspiciously reluctant to do something.
"most people are chary of allowing themselves to be photographed"
synonyms: wary, cautious, circumspect, heedful, careful, on one's guard, guarded, mindful, watchful
I didn't know they made an MSU cart for the Genesis.... I knew about the SNES one and the library for that is rather large but the Genesis one has very few games