- The definition of unfriendly is defined as something unfavorable, or a grouchy or standoffish person.
An example of unfriendly is the character Ebenezer Scrooge in the book A Christmas Carol.
This man looks unfriendly.
- Not friendly.
- Antagonistic or hostile: an unfriendly nation.
(comparative unfriendlier or more unfriendly, superlative unfriendliest or most unfriendly)
- An enemy.