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lost (lôst, lŏst)
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v.
Past tense and past participle of lose.
adj.
1. Unable to find one's way: a lost child.
2.
a. No longer in the possession, care, or control of someone or something: a lost pen.
b. No longer in existence; vanished or spent: lost youth.
c. No longer known or practiced: a lost art.
d. Beyond reach, communication, or influence: The expedition was lost to the world for two months.
3. Not used to one's benefit or advantage: a lost opportunity.
4. Having not been or unlikely to be won; unsuccessful: a lost battle; a lost cause.
5. Beyond recovery or redemption; fallen or destroyed: a lost soul.
6.
a. Completely involved or absorbed; rapt: lost in thought.
b. Bewildered or confused: I'm lostcan you start over?
Idiom:
be lost on
1. To have no effect or influence on: Her advice was lost on me.
2. To be beyond the comprehension of: The lecture was lost on us.

The American Heritage® Dictionary of the English Language, Fifth Edition copyright ©2019 by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
 

Indo-European & Semitic Roots Appendices

    Thousands of entries in the dictionary include etymologies that trace their origins back to reconstructed proto-languages. You can obtain more information about these forms in our online appendices:

    Indo-European Roots

    Semitic Roots

    The Indo-European appendix covers nearly half of the Indo-European roots that have left their mark on English words. A more complete treatment of Indo-European roots and the English words derived from them is available in our Dictionary of Indo-European Roots.

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