lucid

Adjective

• transmitting light; able to be seen through with clarity
  • the cold crystalline water of melted snow
    
  • crystal clear skies
    
  • could see the sand on the bottom of the limpid pool
    
  • lucid air
    
  • a pellucid brook
    
  • transparent crystal
    

• capable of thinking and expressing yourself in a clear and consistent manner
  • a lucid thinker
    
  • she was more coherent than she had been just after the accident
    

• having a clear mind
  • a lucid moment in his madness
    

• (of language) transparently clear; easily understandable
  • writes in a limpid style
    
  • lucid directions
    
  • a luculent oration- Robert Burton
    
  • pellucid prose
    
  • a crystal clear explanation
    
  • a perspicuous argument
    

Related words

• Synonyms: 
  crystalline , crystal clear , limpid , pellucid , transparent , coherent , logical , luculent , perspicuous