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1.
Referring to an event that is unexpected, unforseen, or happens at an inopportune moment.
Bob's dead? No way! We were supposed to swing with he and his wife this weekend. How untimely.
by O.P.A. October 13, 2007
 
2.
Disrespectful of time (people's time, time in general)
She is s always late; she better stop being untimely when she starts her new job.
by Beshax October 13, 2007