Is the garbled circuit adaptive?
Adaptivity essentially refers to giving the adversary the power to choose an input which potentially depends on the garbled circuit, i.e., the input is adaptiveley chosen after seeing the circuit. 

So if a GC scheme is proven secure in the model where the adversary outputs $x$ after seeing the garbled circuit, yes. Otherwise, no.

For formal definitions see, e.g., [1]

References

[1] https://eprint.iacr.org/2015/1250.pdf