leave (one) cold
To not affect one; to bore or underwhelm one. A noun or pronoun is often used between "leave" and "cold." The presentation had some nice points, but in general it just left me cold—it needed something to keep up interest.
leave someone cold
to leave someone unaffected or bored. He said it was dull, and it left him cold. The music's good, but the story left the producer cold.