"impending" in the verb sense
1. impend
be imminent or about to happen
"Changes are impending"
"impending" in the adjective sense
1. at hand, close at hand, imminent, impendent, impending
close in time about to occur
"retribution is at hand"
"some people believe the day of judgment is close at hand"
"in imminent danger"
"his impending retirement"
Source: WordNet® (An amazing lexical database of English)
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