spare
Not taken up by scheduled activities.
“spare time on my hands”
Kept in reserve especially for emergency use.
“a spare tire”
“spare parts”
Thin and fit.
“the spare figure of a marathon runner”
Lacking embellishment or ornamentation.
More than is needed, desired, or required.
“sleeping in the spare room”
Lacking in magnitude or quantity.
“a spare diet”
A score in tenpins; knocking down all ten after rolling two balls.
An extra car wheel and tire for a four-wheel vehicle.
An extra component of a machine or other apparatus.
Save or relieve from an experience or action.
“I'll spare you from having to apologize formally”
Use frugally or carefully.
Refrain from harming.
Give up what is not strictly needed.
“he asked if they could spare one of their horses to speed his journey”