Looking for the meaning or definition of the word otiose? That's all it means.
not useful
otiose, pointless, purposeless, senseless, superfluous, wasted(adj)serving no useful purpose; having no excuse for being
"otiose lines in a play"; "advice is wasted words"; "a pointless remark"; "a life essentially purposeless"; "senseless violence"
futile, ineffectual, otiose, unavailing(adj)producing no result or effect
"a futile effort"; "the therapy was ineffectual"; "an otiose undertaking"; "an unavailing attempt"
faineant, indolent, lazy, otiose, slothful, work-shy(adj)disinclined to work or exertion
"faineant kings under whose rule the country languished"; "an indolent hanger-on"; "too lazy to wash the dishes"; "shiftless idle youth"; "slothful employees"; "the unemployed are not necessarily work-shy"
producing no resultssince you haven't read the book, I suppose that it would be otiose to inquire what you thought of it
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