1. not decisive.
2. Something you could not figure out.
3. not easily deciphered.
You couldn't figure out the meaning of the word indecipherable that's why you are here.
The word indecipherable was not easily deciphered by you.
Some guy nicknamed indecipherable wrote this and I couldn't understand what he was saying.
<Indecipherable> 697 w7di t9q5 dy33w3l