Definitions

1. adjective

lacking in gallantry or courtesy; unchivalrous

“The ungentlemanly behavior of the host towards his guests was a source of embarrassment for everyone.”

2. adverb

in a manner that lacks gallantry or courtesy

“He spoke unkindly to the old lady, which was considered unbecoming of him.”

3. noun

a lack of gallantry or courtesy

“The ungallant behavior of the company was the reason for the customer’s dissatisfaction.”