Antonyms for the word Warm-hearted can be described as the opposite of being friendly, generous, and caring. The first antonym could be cold-hearted, which means being unfeeling and indifferent towards others' feelings. Another antonym could be cruel, which means being insensitive and causing pain and misery. People lacking warmth and kindness can be characterized as callous or unsympathetic. The term insincere is also used when someone is pretending to be warm-hearted, but their actions are solely for their benefit. Heartless and uncaring are two other antonyms that depict a lack of warmth and emotion. In contrast, these antonyms emphasize that warm-hearted people are exceptional and worthy of being cherished.