Use 'indistinct' for objects that can't be seen clearly, often because of distance or poor lighting. The mountains in the distance were indistinct.
Pro Tip 2/3
Ambiguous Feel
'Indistinct' can describe something that gives a sense of uncertainty or something that's not well-defined. The rules of the game were indistinct and caused confusion.
Pro Tip 3/3
Abstract Ideas
Use it when discussing concepts that are difficult to understand or explain because they lack clarity. Her philosophy on life seemed indistinct and complex.