noun

slimness

slenderness, thinness

She admired the slimness of the new phone.

She admired the slimness of the new phone.

the slimness of ((sth.)) the quality of being slim of (sth.) She admired the slimness of the new phone.

Synonyms: slenderness, thinness; Antonyms: bulkiness, thickness

From the adjective 'slim' plus the noun-forming suffix '-ness', which indicates a state or quality.

The suffix '-ness' turns an adjective into a noun describing a quality. So, 'slimness' is the quality of being slim.

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