Collocations for unnecessary - adj.

appear, be, prove, seem
become
make sth, render sth
consider sth, deem sth, regard sth as

completely, entirely, quite, totally, utterly, wholly
No, no, that's quite unnecessary.

largely
rather, somewhat
a little

to
the possession of items strictly unnecessary to survival

Unnecessary is used with these nouns:
alarm, anxiety, bloodshed, bureaucracy, complexity, complication, confusion, death, delay, distraction, distress, duplication, expenditure, expense, hardship, intrusion, jargon, luxury, risk, suffering, violence, waste, worry