Synonyms for Inopportune:

adj.

inappropriate (adjective)
untimely.
inopportune (adjective)
delinquent, awkward, inconvenient, untimely, belated, inexpedient, infelicitous, inappropriate, inauspicious, unpunctual.
not appropriate or suitable (adjective)
inauspicious, ill-timed, unfavorable, mistimed, inappropriate, unseasonable, unsuitable, inconvenient, troublesome, untimely.
untimely (adjective)
delinquent, belated, infelicitous, inexpedient, mistimed, tardy, unpunctual, inauspicious, inconvenient, untimely, overdue, late.

n.

untoward, improper, unbecoming, unseemly, unsuited. time. inconvenient (noun)
unfavorable, unsuitable, troublesome.
inopportune (noun)
wrong, ill-timed, inconvenient, unseasonable, untimely.

Other synonyms:

unsuited, untoward, unsuitable, unbecoming. unfavorable. ill timed
ill-timed.
unsuitable
improper.
Other relevant words:
unseasonable, unbecoming, improper, unseemly, unsuitable, untoward, troublesome, wrong, unfavorable, unsuited, time.

Usage examples for inopportune

  1. " The grave seems to me a vile pitfall, put right in our pathway, and catching most of us,- all of us,- causing us to tumble in at the most inconvenient opportunities, so that all human life is a jest and a farce, just for the sake of this inopportune death; for I observe it never waits for us to accomplish anything: we may have the salvation of a country in hand, but we are none the less likely to die for that. – Septimius Felton or, The Elixir of Life by Nathaniel Hawthorne
  2. At this inopportune moment Miss Silver returned. – John Halifax, Gentleman by Dinah Maria Mulock Craik