godan verb (-ru), intransitive verb
be lost; be missing; disappear
Used for concrete objects that go missing or are lost, such as luggage, keys, or a wallet.
空港でスーツケースがなくなった。
My suitcase went missing at the airport.
I noticed my wallet was missing.
godan verb (-ru), intransitive verb
run out; be used up; be exhausted
Used for consumable resources, supplies, or abstract quantities that are depleted or reduced to zero.
ガソリンがなくなりそうだ。
We're about to run out of gas.
お金がなくなった。
I've run out of money.
godan verb (-ru), intransitive verb
Used for intangible things such as pain, feelings, dreams, or confidence that cease to exist.
薬を飲んだら痛みがなくなった。
The pain disappeared after I took the medicine.
自信がなくなってしまった。
I've lost my confidence.