random \ran"dom\, a.
   1. going at random or by chance; done or made at hazard, or
      without settled direction, aim, or purpose; hazarded
      without previous calculation; left to chance; haphazard;
      as, a random guess.
      1913 webster

            some random truths he can impart.     --wordsworth.
      1913 webster

            so sharp a spur to the lazy, and so strong a bridle
            to the random.                        --h. spencer.
      1913 webster

   2. statistics of, pertaining to, or resulting from a
      process of selection from a starting set of items, in
      which the probability of selecting any one object in the
      starting set is equal to the probability of selecting any
      other.
      pjc

   3. construction of unequal size or shape; made from
      components of unequal size or shape.
      pjc

   at random in a manner so that all possible results have an
      equal probability of occurrence; for processes, each
      possible result is counted separately although the same
      type of result may occur more than once .

   random courses masonry, courses of stone of unequal
      thickness.

   random shot, a shot not directed or aimed toward any
      particular object, or a shot with the muzzle of the gun
      much elevated.

   random work masonry, stonework consisting of stones of
      unequal sizes fitted together, but not in courses nor
      always with flat beds.
      1913 webster
see also:
at random random courses random shot random work 

at random
     adv : in a random manner; "the houses were randomly scattered";
           "bullets were fired into the crowd at random" syn: randomly,
            indiscriminately, haphazardly, willy-nilly, arbitrarily,
            every which way
see also:
randomly indiscriminately haphazardly willy-nilly arbitrarily every which way 

63 moby thesaurus words for "at random":
   aimlessly, any which way, anyhow, anywise, around, at haphazard,
   at hazard, at intervals, at irregular intervals, brokenly,
   by catches, by chance, by fits, by jerks, by snatches,
   capriciously, carelessly, casually, desultorily, disconnectedly,
   discontinuously, dysteleologically, eccentrically, erratically,
   fitfully, haltingly, haphazard, haphazardly, helter-skelter,
   hit or miss, in snatches, in spots, inconstantly, indiscriminately,
   inexplicably, intermittently, irregularly, jerkily, lurchingly,
   nonuniformly, off and on, patchily, promiscuously, purposelessly,
   random, randomly, roughly, sloppily, spasmodically, sporadically,
   spottily, stochastically, unaccountably, uncertainly, unevenly,
   unmethodically, unpredictably, unrhythmically, unsteadily,
   unsystematically, variably, whimsically, wobblingly