simple past tense and past participle of lose

Having wandered from, or unable to find, the way. / In an unknown location; unable to be found. / Not perceptible to the senses; no longer visible. / Parted with; no longer held or possessed.

The fact or quality of being lost.

simple past tense and past participle of lose it

plural of lostness

(idiomatic) not understood or appreciated by (someone)

(colloquial, dismissal) Used to rudely tell somebody to go away or leave one alone.

(intransitive) To lose one's way. / (intransitive, of an object) To go missing; to be in a location unknown to someone who is looking for it. / (intransitive) To be absent, to seem to be absent.

(idiomatic) A person or thing that is hopeless or futile.

(US, Canada, Australia, New Zealand) A department, service or location where items that are found can be claimed by their owners.