Meaning of the word nightmarish in English

What does nightmarish mean in English? Explore the meaning, pronunciation, and specific usage of this word with Lingoland.

nightmarish

US /ˈnaɪt.mer.ɪʃ/
UK /ˈnaɪt.meə.rɪʃ/

Adjective

resembling a nightmare, especially in being terrifying or unpleasant

Example:
The traffic jam was a nightmarish experience.
She woke up from a nightmarish dream.