1. നഷ്ടപ്പെട്ട അർത്ഥം (Nashtappetta arththam): This literally translates to "lost meaning." This would be suitable when talking about a lost understanding of a word, concept, or piece of writing.
2. തെറ്റിദ്ധരിച്ച അർത്ഥം (Thettiddharicha arththam): This means "misunderstood meaning." This would be appropriate if someone misinterpreted what was said or written.
3. അർത്ഥം മനസ്സിലാകാത്തത് (Arththam manassilaakaathaath): This translates to "not understanding the meaning." This is suitable when someone doesn't grasp the intended message.
4. അർത്ഥം പോയത് (Arththam poyaath): This means "meaning lost." This could be used in a more metaphorical sense, where the meaning of something has been lost over time or due to changing contexts.
5. നിർവചനം ഇല്ലാത്തത് (Nirvachanam illaathaath): This translates to "undefined." This would be appropriate if there is no clear meaning for something.
The best translation will depend on the specific situation and what you are trying to express.