You should produce it in “I feel” phrases. That makes it known that it’s your opinion and could be wrong. Treat it like couples therapy.
That's the problem, though - you're trying to make a hiring decision on hopelessly incomplete information, and so it will come down in large part to gut feeling. And the moment you admit to using some non-quantifiable feeling as a basis for not hiring someone, you open yourself up to claims of some form of discrimination.
It's all around safest to just stay quiet.