1.

1). Dim2). Obscure3). Blind4).

Answer»

Something that can’t be seen is 'invisible'. So option 4 is the correct answer. 

Dim: (of a light, colour, or illuminated OBJECT) not SHINING brightly or clearly.

Obscure: not DISCOVERED or known about; uncertain.

Blind: unable to SEE because of injury, DISEASE, or a congenital condition.



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