متأكد

certain, sure

جازم

σίγουρος

Derived from the active participle of تَأَكَّدَ (taʔakkada, “to be certain”), from the root ء ك د (ʔ k d); compare أَكِيد (ʔakīd, “certain”).

Practice speaking and memorizing "متأكد" and many other words and sentences in Arabic.