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In a sentence
Je to čisto praktický problém.
It is a purely practical problem.
Deti spievajú čisto.
The children sing in tune.
Chcem čisto biele tričko.
I want a plain white T-shirt.
Byt je čisto uprataný.
The flat is spotlessly clean.
Source
Slovak National Corpus (SNK) ↗English gloss from the frequency publish path. Hand-reviewed example sentences.
Full attribution on References.