at random

ran·dom  (rndm)

adj.

1. Having no specific pattern, purpose, or objective: random movements. See Synonyms at chance.

2. Mathematics & Statistics Of or relating to a type of circumstance or event that is described by a probability distribution.

3. Of or relating to an event in which all outcomes are equally likely, as in the testing of a blood sample for the presence of a substance.

Idiom:

at random

Without a governing design, method, or purpose; unsystematically: chose a card at random from the deck.

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[From at random, by chance, at great speed, from Middle English randon, speed, violence, from Old French, from randir, to run, of Germanic origin.]

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random·ly adv.

random·ness n.

Thesaurus

Adv.

1.

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