Wiktionary
a. Too sweet; sickeningly sweet.
Usage examples of "sickly sweet".
The smells of hot wax and carbon mingled with pine and the sickly sweet fetor which old people exude when they are almost ready to go over.
The air smelled sickly sweet from lemon verbena that simmered on Binnesman's hearth.
They strode beneath the shadow of the arch, and the air was suddenly sickly sweet with the smell of burning flesh.
The room smelled sickly sweet, and whatever was in those candles made the air thick, languid, and hazy.
The woman was sitting on the ground, in a circle of incense-filled bowls, their smoke sickly sweet.
But then came the first whiff of the foul, sickly sweet odor of The Monster.
He never left his bed, though, and the smell of sickness clung to him day and night, a hot, moist, sickly sweet odor.
From the wound in the rubber he sucked the sickly sweet fluid that gathers inside all air-filled balls, and when he had enough of that began to dismantle and wreck the sailboat.