Scant; not abundant or plentiful.
a spare diet
Sparing; frugal; parsimonious; not spending much money.
Being more than what is necessary, or what must be used or reserved; not wanted, or not used; superfluous.
I have no spare time.
Held in reserve, to be used in an emergency.
a spare anchor; a spare bed or room
Lean; lacking flesh; meager; thin; gaunt.
Very angry; frustrated or distraught.
The poor girl is going spare, stuck in the house all day with the kids like that.
Slow.
One who or that which spares.