Inevitable; certain to happen; a situation or outcome that is bound to occur.
このまま資金が足りなければ倒産は必至だ。
If funds continue to be insufficient, bankruptcy is inevitable.
対策を打たなければ混乱は必至だ。
Without measures, confusion is certain to follow.
過労が続くと体調不良は必至だと医者に言われた。
The doctor told me that if overwork continues, health problems are inevitable.
In shogi, 'hisshi' (必至) denotes a brinkmate — a situation where checkmate is inevitable.
この局面は相手に必至をかけられている。
In this position the opponent has put me in a brinkmate.
詰将棋で必至の手筋を学ぶと終盤力が上がる。
Learning brinkmate tactics in tsume-shogi improves endgame strength.