Obsolete
ISRO Assistant - 2023,
Answer: C
The synonym of obsolete is outdated.
Something obsolete is no longer in use because something newer has replaced it, like the typewriter or the floppy disk. Outdated carries the same meaning.
Useful is nearly the opposite. Unreliable describes something that cannot be trusted to work, which is a different idea, and complete has nothing to do with age or use.
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