Compare unnecessary with other words:
gratis vs. unnecessary
escapable vs. unnecessary
surplus vs. unnecessary
optional vs. unnecessary
extraneous vs. unnecessary
deviation vs. unnecessary
additional vs. unnecessary
needless vs. unnecessary
mandatory vs. unnecessary
needed vs. unnecessary
required vs. unnecessary
requirement vs. unnecessary
need vs. unnecessary
unnecessarily vs. unnecessary
palaver vs. unnecessary
really vs. unnecessary
necessary vs. unnecessary
superfluous vs. unnecessary
obviate vs. unnecessary
essential vs. unnecessary
anarchism vs. unnecessary
save vs. unnecessary
gratuitous vs. unnecessary