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secret
In a sentence
Ona nikdy nevie udržať tajomstvo.
She can never keep a secret.
To nie je Tomovo jediné tajomstvo.
That's not Tom's only secret.
To je moje tajomstvo.
That's my secret.
To je tajomstvo.
That's a secret.
Examples from Tatoeba (CC BY 2.0 FR).
Source
Slovak National Corpus (SNK) ↗English gloss from the frequency publish path. Includes Tatoeba example sentences when present.
Full attribution on References.