heartfelt
/ˈhɑːɹt.fɛlt/ adjective B2- Believed or felt deeply and sincerely. · a heartfelt apology· She expressed her heartfelt sympathies at the death of his mother.
From the library
Had Elizabeth been able to encounter his eyes, she might have seen how well the expression of heartfelt delight diffused over his face became him: but though she could not look she could listen; and he told her of feelings which, in proving of what importance she was to him, made his affection every moment more valuable.
Three days passed thus, during which his prayers were frequent, if not heartfelt.
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