Leftover vs Unused - What's the difference?

As adjectives the difference between leftover and unused

is that leftover is remaining; left behind; extra; in reserve while unused is not used.

is something left behind; an excess or remainder.

* left over, left-over

(-)

Remaining; left behind; extra; in reserve.

Do you want some of the leftover supplies from the event?

(chiefly, in the plural, usually, of food) Remaining after a meal is complete or eaten for a later meal or snack.

I have some leftover spaghetti in the fridge, so I don't plan to cook tonight.

Not leftovers again.

* When used after a verb (as part of a predicate phrase), use two separate words: *: I can walk for miles and still have energy left over.

(en noun)

Something left behind; an excess or remainder.

It's a leftover from yesterday, but it's still perfectly good.

The entire wheel of cheese is a leftover from the party.

The second pronunciation () pronunciation, which is acceptable for either sense and is normally used for the "not used" sense in all registers.

(en adjective)

not used

I have two unused vouchers for a free meal.

not accustomed

I am unused to the dark nights of the countryside.