Anything that discourages.
The act of discouraging.
The loss of confidence or enthusiasm.
A sting on the body of a plant or insect.
Something external that elicits or influences a physiological or psychological activity or response, or that affects any of the sensory apparatuses.
An external phenomenon that has an influence on a system, by triggering or modifying an internal phenomenon; for example, a spur or incentive that drives a person to take action or change behaviour.