不定

indefinite / indeterminate / (botany) adventitious

no; not so / (bound form) not; un-

to set / to fix / to determine / to decide / to order

to hesitate over what move to make (idiom); to waver / to shilly-shally

infinitive (grammar)

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

non-scheduled / irregularly

indeterminate element (math.), often denoted by x

indefinite integral (math.)

infinitive

more likely than not / quite possible / on the cards

indecisive (idiom)

indeterminate form

(math.) indeterminate equation