Definitions

1. adjective

having or showing a rough and violent disposition, or a tendency to behave in a rowdy or disorderly manner.

“The ruffianish behavior of the teenagers at the party was a concern for the parents.”

2. noun

a person who behaves in a rough and violent manner, or in a rowdy or disorderly manner.

“The police officer had to deal with several ruffianish youths causing trouble in the city.”