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slim

In a sentence
Po pravidelnom cvičení má štíhlejšiu postavu.
After exercising regularly, she has a slimmer figure.
Po tréningu má štíhlejšiu postavu.
After training she has a slimmer figure.
Štíhly strom v záhrade ešte nekvitne.
The slender tree in the garden is not blooming yet.
Štíhly stromček ešte potrebuje oporu.
The slender sapling still needs support.
Source
Slovak National Corpus (SNK) ↗English gloss from the frequency publish path. Hand-reviewed example sentences.
Full attribution on References.