apodictic (adjective) infallible: unerring, dependable
Sinonime: according to pleasure, ad-lib, as one thinks best, as one wishes, at will, extemporaneous,
freely, impromptu, improvised,
impulsive, made-up, off-the-cuff, offhand, spontaneously, unrehearsed, without restraint
Antonime: erring, fallible,
faulty,
imperfect