We can use the Euclidean algorithm to find out:
46 = 1*33 + 13
33 = 2*13 + 7
13 = 1*7 + 6
7 = 1*6 + 1
The last remainder is 1, which means 33 and 46 are coprime and gcf(33, 46) = 1.
Another way to see this is to write out the prime factorizations of both numbers:
33 = 3*11
46 = 2*23
As you can see, there are no shared divisors, so the gcf is 1.