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endless

In a sentence
Vesmír je nekonečný.
The universe is infinite.
Pred nimi sa otváral nekonečný výhľad na more.
An endless view of the sea opened before them.
Deti mali nekonečnú energiu až do večera.
The children had endless energy until evening.
Front pred pokladňou pôsobil nekonečne.
The queue at the register seemed endless.
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.