必ず
Kana: かならず
must; be sure to
Example sentence
必ずパスポートを持って来てください。
かならずぱすぽーとをもってきてください。
Be sure to bring your passport.
What 必ず means
必ず (かならず) is a Japanese word meaning “must; be sure to”. It belongs to the Grammar & Phrases topic and appears at Level 2, so it is one of the words worth learning early when you study Japanese.