Adjective
unsourced (not comparable)
Presented without a source or reference.
The unsourced quote was useless as a dictionary citation since no one could tell if it had actually been printed.
Unsourced variant: The most dangerous phrase in the language is, "We've always done it this way." Grace Hopper
Be a master everywhere and wherever you stand is your true place. (Translator unsourced.) Lin-Chi
"Love is a promise, love is a souvenir, once given never forgotten, never let it disappear." - frequently attributed to Lennon, but entirely unsourced. John Lennon
Unsourced variants: Resistance to tyranny is obedience to God, and I shall never pay a penny of this unjust claim. Resistance to tyranny is obedience to God, and I shall never pay a penny of this unjust fine. Susan B. Anthony
Unsourced variant: The only way to win a war is to prevent it. George C. Marshall