otvorenú
Otvorenú is a feminine singular accusative form of the Slovak adjective otvrený (written with proper diacritics as otvorený in masculine, otvorená in feminine nominative, and otvorené in neuter). It means open or opened and is used to describe a feminine noun in the accusative case. In practice, it appears in phrases such as otvorenú knihu (an opened book) or otvorenú obálku (an opened envelope). The form reflects Slovak agreement rules for adjectives and participles: the base stem otvoren- comes from the verb otvoriť (to open), and the ending -ú marks feminine singular accusative.
Etymology and usage: otvorený derives from otvoriť and functions both as a past participle and as a
Grammatical notes: As with other Slovak adjectives, otvorenú must agree with the noun it modifies in gender,