Definitions

1. adjective

having or showing a rough, impolite, or unpleasant manner

“The loutish behavior of the group at the concert was disturbing to many attendees.”

2. adverb

in a rough, impolite, or unpleasant manner

“He yelled loutishly at the referee, drawing a yellow card.”

3. noun

a person who behaves in a rough, impolite, or unpleasant manner

“The loutish individual was asked to leave the restaurant by the manager.”