forbidding

那道数学题看起来复杂得让人望而却步。

The math problem looked ___forbidding complex at first glance.

那些高耸的铁丝网和警示标志让这片区域显得令人望而却步。

The towering barbed wire and warning signs made the area look ___forbidding.

那座废弃工厂的铁门看起来令人生畏，散发着阴森的气息。

The abandoned factory's iron gate looked ___forbidding and gave off an eerie vibe.