1. not having developed or changed over time; remaining in a primitive or basic state

Examples

• The species remained unevolved for millions of years.
• His unevolved thinking prevented him from accepting new ideas.
• The technology seemed unevolved compared to modern standards.
• Critics called the plot unevolved and predictable.
• The unevolved organism lacked complex features.
• Her unevolved approach to problem-solving was ineffective.