transparent

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 cristal”

so thin as to transmit light

• “a hat with a diaphanous veil”
• “filmy wings of a moth”
• “gauzy clouds of dandelion down”
• “gossamer cobwebs”
• “sheer silk stockings”
• “transparent chiffon”
• “vaporous silks”

free of deceit

easily understood or seen through (because of a lack of subtlety)

• “a transparent explanation”
• “a transparent lie”