1. in a clear and obvious way; evidently
2. in a simple, direct manner without decoration or elaboration
3. in an honest, frank way

Examples

• She was plainly upset about the news.
• The instructions were plainly written on the package.
• He plainly stated his opinion without sugar-coating it.
• The room was plainly decorated with white walls and simple furniture.
• It’s plainly obvious that we need more time.
• She dressed plainly in a simple black dress.
• The teacher plainly explained the math problem to the students.