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In a sentence
Počas skúšky pracovala sústredene a bez prestávky.
During the exam, she worked with concentration and without a break.
Sústredene počúval, čo mu lekár vysvetľuje.
He listened attentively to what the doctor was explaining.
Deti sústredene skladali veľké puzzle.
The children concentrated as they put together a large puzzle.
Pred dôležitým rozhovorom sa sústredene pripravovala.
Before the important conversation, she prepared with concentration.
Source
Slovak National Corpus (SNK) ↗English gloss from the frequency publish path. Hand-reviewed example sentences.
Full attribution on References.