1735, from in- (1) "not, opposite of, without" + decision. Perhaps from or modeled on French indécision (17c.), which Cotgrave's "French and English Dictionary" (1673) translates with An undecision.
his indecision was only momentary but the opportunity was lost
indearing
indebted
indecency
indecent
indecipherable
indecision
indecisive
indeclinable
indecorous
indecorum
indeed
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