Etymology
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inopportune (adj.)

"inconvenient, unseasonable, unsuitable, inappropriate, unfit," 1530s, from Late Latin inopportunus "unfitting," from in- "not" (from PIE root *ne- "not") + opportunus "favorable, convenient" (see opportune). Rare or obsolete in 18c. Related: Inopportunely; inopportuneness; inopportunity.

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unseasonable (adj.)
mid-15c., "inopportune," from un- (1) "not" + seasonable (adj.). In reference to weather, "not appropriate to the time of year," it is recorded from 1510s. Related: Unseasonably.
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