Synonyms for Imminent:

adj.

all (adjective)
at hand, impending, close at hand.
approaching (adjective)
converging, impending, approaching, near, forthcoming, coming, advancing, Looming, proximate, nearby, expected, closing.
at hand, on the way (adjective)
in store, in the wind, next, probable, brewing, likely, on the verge, on the horizon, Looming, approaching, coming, on its way, forthcoming, near, to come, immediate, close, following, in the offing, impending, in view, in the cards, about to happen.
close (adjective)
proximate, around the corner.
future (adjective)
close at hand, in the cards.
probable (adjective)
likely.

n.

guaranteed, likely, bound, sure, certain, possibly, probably, probable, good. momentary. imminent (noun)
close, close at hand, at hand, impending.

Other synonyms:

destined. momentary. forthcoming
in the offing.

Usage examples for imminent

  1. He knew the hour was imminent when he must read his heart. – The U.P. Trail by Zane Grey
  2. The King throughout behaved with great judgment, nor is it so true that he surrendered Cowell to his enemies, as that he saved him from imminent personal peril. – Books Condemned to be Burnt by James Anson Farrer