Meaning : Exactly alike. Incapable of being perceived as different.
Example :
Rows of identical houses.
Cars identical except for their license plates.
They wore indistinguishable hats.
Synonyms : identical
Meaning : Not capable of being distinguished or differentiated.
Example :
The two specimens are actually different from each other but the differences are almost indistinguishable.
The twins were indistinguishable.
A colorless person quite indistinguishable from the colorless mass of humanity.
Synonyms : undistinguishable
Capable of being perceived as different or distinct.
Only the shine of their metal was distinguishable in the gloom.