na-adjective, noun
severe; harsh; rigorous; cruel
Describes conditions, treatment, environments, or demands that are extremely tough, merciless, or punishing. Often used for weather, work, rules, or criticism.
今年の夏は過酷な暑さが続いている。
This summer, severe heat has been continuing.
彼は過酷な労働条件に耐えられなかった。
He couldn't endure the harsh working conditions.
過酷な訓練を乗り越えて、選手は強くなった。
After overcoming rigorous training, the athlete became stronger.