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Use "undefinable" in a sentence
"Defining the undefinable is their dirty job, and they have my sympathy."
"If so, written constitutions are worse than useless; they are not obligatory, there is no penalty for their violation; obedience to them cannot be enforced; there is no government but that of opinion, fluctuating and uncertain, undefined and undefinable, which is paramount to the fundamental law."
"Throughout his career, Kenton pursued a Quixote-like quest for a kind of undefinable art music that, in his own eyes, he never achieved although the symphony-sized "Neophonic" orchestra of the mid-'60s probably came closest."