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Unpredictable (closest to mathematical definition); weird. "The system's been behaving pretty randomly."
Assorted; undistinguished. "Who was at the conference?" "Just a bunch of random business types."
(pejorative) Frivolous; unproductive; undirected. "He's just a random loser."
Incoherent or inelegant; poorly chosen; not well organised. "The program has a random set of misfeatures." "That's a random name for that function." "Well, all the names were chosen pretty randomly."
In no particular order, though deterministic. "The I/O channels are in a pool, and when a file is opened one is chosen randomly."
Arbitrary. "It generates a random name for the scratch file."
Gratuitously wrong, i.e. poorly done and for no good apparent reason. For example, a program that handles file name defaulting in a particularly useless way, or an assembler routine that could easily have been coded using only three registers, but redundantly uses seven for values with non-overlapping lifetimes, so that no one else can invoke it without first saving four extra registers. What randomness!
A random hacker; used particularly of high-school students who soak up computer time and generally get in the way.