Synonyms of the word

undefinable

• adj. Not definable.
• n. Anything that cannot be defined.

indefinable

• adj. That cannot be precisely defined or put into words.
• adj. That defies description; indescribable.
• n. Anything that cannot be defined.

undefined

• adj. Lacking a definition or value.
• adj. (mathematics, computing) That does not have a meaning and is thus not assigned an interpretation.

vague

• adj. Not clearly expressed; stated in indefinite terms.
• adj. Not having a precise meaning.
• adj. Not clearly defined, grasped, or understood; indistinct; slight.
• adj. Not clearly felt or sensed; somewhat subconscious.
• adj. Not thinking or expressing one’s thoughts clearly or precisely.
• adj. Lacking expression; vacant.
• adj. Not sharply outlined; hazy.
• adj. Wandering; vagrant; vagabond.
• n. (obsolete) A wandering; a vagary.
• n. An indefinite expanse.
• v. To wander; to roam; to stray.