An antonym would be "Crucial"
O Captain!<span> my Captain!</span><span> rise up and hear the bells;</span>
Rise up—for you the flag is flung—for you the bugle trills,
For you bouquets and ribbon'd wreaths—for you the shores a-crowding,
<span>For you they call, the swaying mass, their eager faces turning;</span>
Cause they spent all their money at the bar trying to impress the 22 year old girl who turned out to be a man
