- 恐れる — to fear / be afraid
- 恐ろしい — dreadful / terrifying
- 恐怖 — fear / terror
- 恐慌 — panic
- 恐喝 — extortion / intimidation
- 恐縮 — (to be) obliged / feel humbled
- 恐竜 — dinosaur
With 心 at the base, 恐 centers on the heart’s reaction—tightening, drawing back, standing in awe. The On-reading キョウ shows up across common words (恐怖・恐慌・恐縮). As a verb, 恐れる covers both “to fear” and respectful “to be in awe.”