1.
frightening, terrifying
Causing fear.
恐ろしい夢を見た。
I had a frightening dream.
恐ろしい顔をしている。
He has a frightening face.
一人で夜道を歩くのは恐ろしい。
Walking alone on a dark road at night is frightening.
2.
terrible, awful
Extremely bad or serious.
恐ろしい事故だった。
It was a terrible accident.
恐ろしい被害が出た。
There was terrible damage.
台風の恐ろしさを知った。
I learned the terrible power of a typhoon.
3.
amazing, incredible
Extraordinary (colloquial intensifier).
恐ろしいスピードで走る。
To run at an incredible speed.
恐ろしく高い。
It's incredibly expensive.
彼女は恐ろしいほどの記憶力を持っている。
She has an incredible memory.
恐ろしい is an i-adjective meaning frightening or terrible, stronger than 怖い.
FORMS:
- Adverbial: 恐ろしく
- Noun form: 恐ろしさ (terribleness)
INTENSIFIER USE:
恐ろしく + adjective/adverb means 'terribly, incredibly':
- 恐ろしく速い: terribly fast
- 恐ろしく高い: incredibly expensive
SIMILAR WORDS:
- 怖い: scary, afraid (more common in daily speech)
- 恐怖: fear, terror (noun)
- 物凄い: tremendous, incredible
NOTE:
In colloquial use, 恐ろしい can express amazement at something extreme, not necessarily fear.