1. caused by or capable of being transmitted by infection
Usage: medical
2. spreading quickly and easily from one person to another
Usage: figurative

Examples

• The doctor warned that the disease was highly infectious.
• She stayed home to avoid spreading the infectious illness.
• Measles is an infectious disease that spreads through airborne droplets.
• His infectious laughter made everyone in the room start giggling.
• The team’s infectious enthusiasm motivated the entire department.
• Her infectious smile brightened everyone’s day.
• The infectious rhythm of the music got everyone dancing.