The phrase "slight boy" is correct and usable in written English.
You can use it to describe a boy who is slim or small in stature. For example: "The slight boy meekly entered the room, barely making a sound."
BRATTLEBORO, Vt .— Down Clown Alley, in the backstage tent for Circus Smirkus, a slight boy of 14 studies his clown self in a jagged piece of mirror.
As he stood on platform two, with rains engulfing the night, this young, slight boy who had yet to even complete his fourth grade made a decision that would change the course of his life for ever.
Spread around were the artifacts of a family: crystal glasses, mementos from Nicaragua, a toy truck and a photo of her younger son at 12, a slight boy in a striped shirt.
"Two soldiers came to us and told us: 'Come over here.' We went to them," said Al-Hasan, a slight boy, neatly dressed, who barely looks his 13 years.
He was, he reveals, physically awkward, mortified by his family's poverty, a slight boy who was abused by his stepfather in a Little Rock, Ark., community that revered football players.
"Yes, I'm satisfied with the work," said Guo Peng, a slight boy with the first hint of a mustache, who said he was 18 and had just graduated from middle school in rural Shanxi Province.
The little boy was having slight problems reciting all the mantras he had to remember.
A little boy who screams at the slightest touch, a little boy who found the strength when he was a year old to pick up a heavy wooden chair and throw it across the room.
A slight, sallow boy made the first recording.
He was a slight, sickly boy, hampered by an infected gland in his neck.
"You know, where it sags in the back?" A slight Asian boy wearing gray jeans and a gray T-shirt stepped out of a stall.
