Source : Webster's Revised Unabridged Dictionary (1913)

Lost \Lost\, a. [Prop. p. p. of OE. losien. See {Lose}, v. t.]
   1. Parted with unwillingly or unintentionally; not to be
      found; missing; as, a lost book or sheep.

   2. Parted with; no longer held or possessed; as, a lost limb;
      lost honor.

   3. Not employed or enjoyed; thrown away; employed
      ineffectually; wasted; squandered; as, a lost day; a lost
      opportunity or benefit.

   5. Having wandered from, or unable to find, the way;
      bewildered; perplexed; as, a child lost in the woods; a
      stranger lost in London.

   6. Ruined or destroyed, either physically or morally; past
      help or hope; as, a ship lost at sea; a woman lost to
      virtue; a lost soul.

   7. Hardened beyond sensibility or recovery; alienated;
      insensible; as, lost to shame; lost to all sense of honor.

   8. Not perceptible to the senses; no longer visible; as, an
      island lost in a fog; a person lost in a crowd.

   9. Occupied with, or under the influence of, something, so as
      to be insensible of external things; as, to be lost in
      thought.

   {Lost motion} (Mach.), the difference between the motion of a
      driver and that of a follower, due to the yielding of
      parts or looseness of joints.

Source : WordNet®

lose
     v 1: fail to keep or to maintain; cease to have, either
          physically or in an abstract sense; "She lost her purse
          when she left it unattended on her seat" [ant: {keep}]
     2: fail to win; "We lost the battle but we won the war" [ant: {win}]
     3: suffer the loss of a person through death or removal; "She
        lost her husband in the war"; "The couple that wanted to
        adopt the child lost her when the biological parents
        claimed her"
     4: place (something) where one cannot find it again; "I
        misplaced my eyeglasses" [syn: {misplace}, {mislay}]
     5: miss from one's possessions; lose sight of; "I've lost my
        glasses again!" [ant: {find}]
     6: allow to go out of sight; "The detective lost the man he was
        shadowing after he had to stop at a red light"
     7: fail to make money in a business; make a loss or fail to
        profit; "I lost thousands of dollars on that bad
        investment!"; "The company turned a loss after the first
        year" [syn: {turn a loss}] [ant: {profit}, {break even}]
     8: fail to get or obtain; "I lost the opportunity to spend a
        year abroad" [ant: {acquire}]
     9: retreat [syn: {fall back}, {drop off}, {fall behind}, {recede}]
        [ant: {gain}]
     10: fail to perceive or to catch with the senses or the mind; "I
         missed that remark"; "She missed his point"; "We lost
         part of what he said" [syn: {miss}]
     11: be set at a disadvantage; "This author really suffers in
         translation" [syn: {suffer}]
     [also: {lost}]

lost
     adj 1: no longer in your possession or control; unable to be found
            or recovered; "a lost child"; "lost friends"; "his
            lost book"; "lost opportunities" [ant: {found}]
     2: having lost your bearings; confused as to time or place or
        personal identity; "I frequently find myself disoriented
        when I come up out of the subway"; "the anesthetic left
        her completely disoriented" [syn: {confused}, {disoriented}]
     3: spiritually or physically doomed or destroyed; "lost souls";
        "a lost generation"; "a lost ship"; "the lost platoon"
        [ant: {saved}]
     4: not gained or won; "a lost battle"; "a lost prize" [ant: {won}]
     5: incapable of being recovered or regained; "his lost honor"
     6: not caught with the senses or the mind; "words lost in the
        din" [syn: {missed}]
     7: deeply absorbed in thought; "as distant and bemused as a
        professor listening to the prattling of his freshman
        class"; "lost in thought"; "a preoccupied frown" [syn: {bemused},
         {deep in thought(p)}, {lost(p)}, {preoccupied}]
     8: no longer known; irretrievable; "a forgotten art"; "a lost
        art"; "lost civilizations" [syn: {forgotten}]
     9: perplexed by many conflicting situations or statements;
        filled with bewilderment; "obviously bemused by his
        questions"; "bewildered and confused"; "a cloudy and
        confounded philosopher"; "just a mixed-up kid"; "she felt
        lost on the first day of school" [syn: {baffled}, {befuddled},
         {bemused}, {bewildered}, {confounded}, {confused}, {mazed},
         {mixed-up}, {at sea}]
     10: unable to function; without help [syn: {helpless}]

lost
     n : people who are destined to die soon; "the agony of the
         doomed was in his voice" [syn: {doomed}]

lost
     See {lose}