open-ended

open–end·ed

adjective \ˌō-pən-ˈen-dəd\

: able to change : not ending in a certain way or on a certain date

: allowing people to talk in a way that is not planned or controlled

Full Definition of OPEN-ENDED

:  not rigorously fixed: as

a :  adaptable to the developing needs of a situation

b :  permitting or designed to permit spontaneous and unguided responses

— open–end·ed·ness noun

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First Known Use of OPEN-ENDED

1825