When it comes to describing something or someone that lacks warmth and seems unapproachable, "cold as marble" is a fitting description. However, there are several alternative phrases that convey the same idea. For example, "icy demeanor" suggests a frosty disposition that is difficult to penetrate. "Chilly reception" implies a lack of warmth or enthusiasm towards someone or something. "Frigid attitude" paints a picture of a character who is indifferent or aloof. "Frozen heart" reflects a person's lack of empathy or compassion. These synonyms for "cold as marble" show the many ways in which our language can convey a similar meaning in different ways.