From the heart is a phrase that we commonly use to describe something that is genuine and sincere. However, there are several synonyms for the word "from the heart" that you can use to add more depth and variety to your writing or speaking. You could use expressions like heartfelt, sincere, genuine, candid, unfeigned, or honest to convey a similar meaning. Similarly, you could describe something as authentic, deep-seated, or earnest to emphasize its genuineness. Using synonyms for from the heart can make your writing or speech more engaging and help you express yourself more effectively.