contagiously

Example:He laughed infectiously, making everyone else smile.

Definition:in an infectious or quickly spreading manner; in a way that leads to imitation or enthusiasm

Example:His negative attitude was contaminatingly spreading among the team.

Definition:in a manner that spreads a bad feeling or illness; in an unpleasant or damaging way

Example:Her happiness spreadingly flew through the group of friends.

Definition:in a manner that quickly spreads something, especially an emotion or disease

Example:The fear spread contagiously-infectiously throughout the building.

Definition:describes the quality of spreading both quickly and in an intensity that can be imitated or caught like an emotion or illness