idiot-proof

humorous informal

(informal, humorous) Incapable of being misused even by the most stupid or careless of users.

Japanese Meaning

（非公式・ユーモラス）最も愚か、または不注意な使用者でも誤用できないほど、使いやすく設計された / （非公式）誰でも簡単に誤りなく使用できる設計の

The new coffee maker is completely idiot-proof, so even I can't mess it up.

その新しいコーヒーメーカーは完全に誤操作を防ぐ設計で、私でさえ失敗しません。

Sense（1）

(informal, humorous) Incapable of being misused even by the most stupid or careless of users.

I tell you, this scheme is idiot-proof! It can't go wrong.

more idiot-proof

（ comparative ）

most idiot-proof

（ superlative ）