capricious β Someone who is capricious often changes their mind unexpectedly.
erratic β Not even or regular in pattern or movement; unpredictable.
intermittent β stopping or ceasing for a time; alternately ceasing and beginning again: an intermittent pain.
jerky β characterized by jerks or sudden starts; spasmodic.
sporadic β (of similar things or occurrences) appearing or happening at irregular intervals in time; occasional: sporadic renewals of enthusiasm.
uneven β not level or flat; rough; rugged: The wheels bumped and jolted over the uneven surface.
unreliable β not reliable; not to be relied or depended on.
aberrant β Aberrant means unusual and not socially acceptable.
eccentric β deviating from the recognized or customary character, practice, etc.; irregular; erratic; peculiar; odd: eccentric conduct; an eccentric person.
faltering β to hesitate or waver in action, purpose, intent, etc.; give way: Her courage did not falter at the prospect of hardship.
weaving β to interlace (threads, yarns, strips, fibrous material, etc.) so as to form a fabric or material.
aimless β A person or activity that is aimless has no clear purpose or plan.
casual β If you are casual, you are, or you pretend to be, relaxed and not very concerned about what is happening or what you are doing.
changeable β Someone or something that is changeable is likely to change many times.
spasmodic β pertaining to or of the nature of a spasm; characterized by spasms.
uncertain β not definitely ascertainable or fixed, as in time of occurrence, number, dimensions, or quality.
unconsidered β thought about or decided upon with care: a considered opinion.
methodic β performed, disposed, or acting in a systematic way; systematic; orderly: a methodical person.
unpunctual β strictly observant of an appointed or regular time; not late; prompt.
unsettled β not settled; not fixed or stable; without established order; unorganized; disorganized: an unsettled social order; still unsettled in their new home.
unsteady β not steady or firm; unstable; shaky: an unsteady hand.
unsystematic β having, showing, or involving a system, method, or plan: a systematic course of reading; systematic efforts.
up and down β moving in or related to a direction that is up or is regarded as up: the up elevator; the up train traveling north; the up platform of a railroad station.
random β proceeding, made, or occurring without definite aim, reason, or pattern: the random selection of numbers.
variable β apt or liable to vary or change; changeable: variable weather; variable moods.