| lossless | (adjective) characterized by or causing no dissipation of energy | - |
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| lossy | (adjective) characterized by or causing dissipation of energy | - |
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| lost | (adjective) no longer in your possession or control; unable to be found or recovered | - |
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| (adjective) spiritually or physically doomed or destroyed | - |
| (adjective) not gained or won | - |
| (adjective) unable to function; without help | Synonyms: helpless |
| (adjective) not caught with the senses or the mind | Synonyms: missed |
| (adjective) perplexed by many conflicting situations or statements; filled with bewilderment | Synonyms: at sea, baffled, befuddled, bemused, bewildered, confounded, confused, mazed, mixed-up |
| (adjective) deeply absorbed in thought | Synonyms: bemused, preoccupied |
| (adjective) having lost your bearings; confused as to time or place or personal identity | Synonyms: confused, disoriented |
| (adjective) cannot be recovered or regained | - |