rubbish nothing
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useless, worthless, unconstructive, unhelpful...
This could be dysfunctional, disadvantageous, disposable, dispensable, defunct, discarded, doomed, dead.
useless
to reduce (an object) to useless fragments, a useless form,or remains, as by rending, burning, or dissolving; injurebeyond repair or renewal; demolish; ruin; annihilate. to put an end to; extinguish. to kill; slay. to render ineffective or useless; nullify; neutralize;invalidate. to defeat completely.
The word trivial means "useless". So a trivial set would be a useless set.