spoken or performed without practicing or preparing

unrehearsed, improvised

happening by chance

chance, random

(spoken or done) without previous thought or preparation

offhand

without preparation

unrehearsed, improvised

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

tending to act without thought

done, happening, from feelings, not suggested or planned

impulsive, willing

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