at random

In no order

At random describes selection or occurrence without pattern, plan, or predictable order.

When something happens at random, each possibility has an equal or unknown chance of being chosen: Names were drawn at random from a hat.

The phrase often implies arbitrariness or lack of deliberate intent: He fired at random into the crowd.

In technical contexts, truly random processes are distinguished from those that merely appear unpredictable.

chance

lottery

Randomized prize distribution

  • rouletteSpinning wheel wager
  • diceMarked cubes for chance
  • luckChance affecting outcomes

fluke · serendipity · coincidence · probability · odds · stochastic · aleatory · fortuitous · incalculable · unforeseeable

haphazard

disorganized

Lacking systematic arrangement

hit-or-miss · unsystematic · aimless · slapdash · careless · jumbled · disordered · messy · indiscriminate · unstructured

spontaneous

impromptu

Without advance preparation

offhand · ad-lib · extemporaneous · unpremeditated · impulsive · instinctive · unrehearsed · unscripted · off-the-cuff · snap

arbitrary

capricious

Subject to sudden changes

unjust · unfair · discriminatory · preferential · selective · partial · prejudiced · unequal · inequitable · favoritism

Opposites
selection method

at randomsystematically

In organized, planned fashion

deliberately · intentionally · by design · methodically · purposefully

order and predictability

at randomin order

Arranged as intended

sequentially · predictably · regularly · uniformly · consistently

Family

random, randomly, randomness, rand, randomized, randomize, nonrandom, randomization, randomizing

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Known to kids · Used worldwide · Timeless · Abstract · Everyday, not technical · Rated G