random
ran-dom
adjective
Lacking a definite plan, order, or purpose; chosen without method or conscious decision.
"They picked a random card from the deck."
adjective
Strange, unusual, or unexpected; seemingly out of place or without obvious connection.
"That was a really random thing to say."
Thesaurus
Synonyms: ergodic, haphazard, hit-or-miss, stochastic
Antonyms: nonrandom