確実
かくじつ · kakujitsu · JLPT N3 · na-adj
reliability
🔒 確実 = firm/certain (確) + real/fruit (実): solidly real
確 means firm or confirmed, as in 確認 (confirm). 実 means real or true, as in 実は (actually). Together they mean something that is firmly real: certain and reliable. 確実に means for sure.