"sureness" in the noun sense
1. assurance, self-assurance, confidence, self-confidence, authority, sureness
freedom from doubt belief in yourself and your abilities
"his assurance in his superiority did not make him popular"
"after that failure he lost his confidence"
"she spoke with authority"
2. sureness
the quality of being steady and unfailing
"sureness of hand"
Source: WordNet® (An amazing lexical database of English)
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