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enemy

In a sentence
Nepriateľ na nás zaútočil.
The enemy launched an attack on us.
Nepriateľ môjho nepriateľa je môj priateľ.
The enemy of my enemy is my friend.
Nemám jediného nepriateľa.
I don't have a single enemy.
Ste naším nepriateľom?
Are you our enemy?
Examples from Tatoeba (CC BY 2.0 FR).
Source
Slovak National Corpus (SNK) ↗English gloss from the frequency publish path. Example sentences from Tatoeba (CC BY 2.0 FR).
Full attribution on References.