Definitions

1. adjective

somewhat like or related to night, especially in being dark or nocturnal

“The nightish hours on the farm were the most challenging to manage.”

2. adverb

in a manner related to night, especially in being dark or nocturnal

“She spent the nightish hours reading a book under a dim lamp.”

3. noun

a period of time somewhat like or related to night, especially in being dark or nocturnal

“The nightish was a difficult time to navigate the roads.”