Definitions

1. adjective

somewhat tight; not very loose

“I need to tighten the screws, but I don’t want to make them too tightish, or they might strip.”

2. adverb

in a somewhat tight manner

“He put the blanket on the bed tightish, making sure it stayed in place.”

3. noun

a somewhat tight fit or condition

“The tightish fit of the shoes was uncomfortable for her.”