Synonyms of the word

unnameable

• adj. That cannot, or should not, be named.

ineffable

• adj. Beyond expression in words; unspeakable.
• adj. Forbidden to be uttered; taboo.

sacred

• adj. Characterized by solemn religious ceremony or religious use, especially, in a positive sense; consecrated;…
• adj. Religious; relating to religion, or to the services of religion; not secular.
• adj. Spiritual; concerned with metaphysics.
• adj. Designated or exalted by a divine sanction; possessing the highest title to obedience, honor, reverence,…
• adj. Not to be profaned or violated; inviolable.
• adj. (followed by the preposition "to") Consecrated; dedicated; devoted.
• adj. (archaic) Solemnly devoted, in a bad sense, as to evil, vengeance, curse, or the like; accursed; baleful.
• v. simple past tense and past participle of sacre.

unspeakable

• adj. Incapable of being spoken or uttered; unutterable; ineffable; inexpressible.
• adj. Unfit or not permitted to be spoken or described.
• adj. Extremely bad or objectionable.

unutterable

• adj. Not utterable; incapable of being spoken or voiced; inexpressible; ineffable; unspeakable.