made secret (verb) encode: encrypt
Sinonime: beyond price, cherished, collectible,
costly,
dear,
expensive, incalculable,
incomparable, inestimable,
invaluable, out-of-bounds, out-of-sight, prized,
rare,
rich, treasured,
valuable,
valued, without price, worth a king's ransom, worth its weight in gold
Antonime: cheap, replaceable,
useless,
worthless