This is the 4690th most frequent Korean word.
것이냐
A formal/poetic question form meaning "is it" or "is this" depending on context.
것이냐: Used to ask about the nature or condition of the task.
이 일이 정말 어려운 것이냐?
Is this task really difficult?
것이냐: Used to differentiate between choices or possibilities.
그것이냐 아니면 다른 것이냐?
Is it that one, or something else?
것이냐: Used to inquire about the truth or validity of a statement.