It means random. It comes from two early modern english words "hap" which you probably know as "happen" and "hazard" which used to be a verb meaning "to risk, to take a chance" but is now a noun meaning a danger. So it means something that happens by chance, randomly.
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the jump was very last minute, or haphazard.
hazard
HERE ARE 3 SENTENCES:Haphazard is an annoying word and is time consuming to type.A sentence with the word haphazard in it is the sentence I'm typing right now.Another sentence with the word haphazard is the question that goes with this answer.
Brownian motion see http://en.wikipedia.org/wiki/Brownian_motion
Depending on your need, haphazardly may work. Haphazard events may be chaotic, but they may not meet statistical requirements for randomness.