either of a pair of lovers in relation to the other.

( sometimes initial capital letter ) an affectionate or familiar term of address.

a beloved person.

Informal . a generous, friendly person.

Informal . anything that arouses loyal affection

My old car was a real sweetheart.

noun

enemy , foe

noun

admirer , beau , beloved , boyfriend , companion , darling , dear , dear one , flame , girlfriend , heartthrob , honey * , inamorata , inamorato , love , lovebird , lover , one and only , paramour , pet , significant other , steady * , suitor , swain , sweet , treasure * , truelove , valentine , honey , minion , precious , (female) ladylove , (male) lover , adorer , amaryllis , deary , doll , dreamboat , dulcinea , ladylove , lass , mistress , rose , spark