perhaps; possibly; it's likely that

hesitant and unable to make a firm choice or decision between multiple options

to hesitate or waver when faced with a decision; to be unable to make up one's mind

unstable, unpredictable, or flickering in movement, appearance, or thought

unpredictable; elusive; hard to pin down

the infinitive mood in grammar

to fluctuate or shift back and forth without pause

not occurring at fixed or regular intervals; non-scheduled

indefinite article (e.g. English a, an)

(math.) indeterminate equation

an indeterminate element in mathematics, often denoted by x

indefinite integral (math.)

indeterminate form; amorphous

more likely than not; quite possible; unpredictable; one cannot be sure that something won't happen

indecisive (idiom)