すらっと

す

ら

っ

と

JLPTN1Freq.FrequencyTop 100,000

すらっとする · noun or participle which takes 'suru'

Meanings

Describes a person's figure, limbs, or an object as attractively long and slender. Often used with した or している. Mimetic word.

〈人ひと〉がすらっとしているsomeone is slender/lanky (in an attractive way)
彼かの女じょは背せが高たかくてすらっとしている。
She is tall and slender.
すらっと伸のびた〈物もの〉something (limbs, legs, etc.) that is long and slender
モデルのすらっと伸のびた脚あしが印いん象しょう的てきだった。
The model's long, slender legs were striking.
すらっとした〈体たい型けい〉a slender, sleek build
彼かれはすらっとした体たい型けいでスーツが似に合あう。
He has a slender build and suits look good on him.

すらりN1
すらり and すらっと both describe attractive slenderness, but すらっと often carries a slightly sharper, more sudden or striking impression of sleekness.
ほっそりN1
ほっそり emphasizes thinness itself (sometimes delicately or fragilely so), while すらっと stresses attractive length and proportion rather than mere thinness.
スマートN3
スマート is a katakana loanword for a slim, stylish figure (and can also mean 'smart/clever'), whereas すらっと is a native mimetic word focused purely on sleek slenderness.

ずんぐり
ずんぐり describes a short, stout, squat build, the opposite of the attractively long and slender impression given by すらっと.

Mimetic word; the exact origin is uncertain, but it is related to the sound-symbolic root すら- suggesting smoothness or slenderness.