sweet

Easy to be imposed on, or taken in ; also expert, dexterous clever.
Sweet's your hand ; said of one dexterous at stealing.
sweet heart

A term applicable to either the masculine or feminine gender, signifying a girl's lover, or a man's mistress : derived from a sweet cake in the shape of a heart.
sweetness

Guinea droppers, cheats, sharpers.

To sweeten ; to decoy, or draw in.

To be sweet upon ; to coax, wheedle, court, or allure.
He seemed sweet upon that wench ; he seemed to court that girl.

The 1811 Dictionary of the Vulgar Tongue.