Excess is a related term of recklessness.
As nouns the difference between excess and recklessness
is that
excess is the state of surpassing or going beyond limits; the being of a measure beyond sufficiency, necessity, or duty; that which exceeds what is usual or proper; immoderateness; superfluity; superabundance; extravagance; as, an excess of provisions or of light while
recklessness is the state or quality of being reckless or heedless, of taking unnecessary risks.
As an adjective excess
is more than is normal, necessary or specified.