spoken or performed without practicing or preparing

unrehearsed, improvised

happening by chance

chance, random

happening without having been planned; depending on chances

without plan or organization

done, acting, quickly and without enough thought or care

acting without thinking

without preparation

unrehearsed, improvised

(of a person, behaviour) acting on, resulting from an impulse

tending to act without thought

not intentional

accidental

done without a desire, thought or intention; (of muscle, physical action) moving without conscious control

automatic; not done willingly

without any particular reason

haphazard, chance

(of) a word or verb form showing that the action of a sentence is on the person or thing doing it

automatic; not done willingly

careless; indiscreet

thoughtless; unwary

not intentional

not planned

not intentional

unintentional

(of an answer, action) not said, done etc as the result of a hint, suggestion etc

tending to act without thought

that could not have been imagined

accidental