Ranked by relevance and common usage.
Keep "mysteriousness" when the sentence already sounds natural, when a synonym would add unintended emphasis, or when readers need the most familiar wording. A synonym should clarify or sharpen the message, not simply make the sentence look more varied.
If two options seem close, choose the one that best matches the audience and purpose of the sentence.
Choose a synonym only if it keeps the core idea of "mysteriousness" intact in the sentence you are editing.
Check whether the replacement sounds more formal, casual, emotional, technical, or forceful than the original word.
Read the full sentence after the swap. Keep the synonym only when the sentence becomes clearer or more precise.
Review note: Synonym lists are ranked with lexical data and reviewed for practical writing value. Use the comparison notes, sentence evidence, and source labels together; a high-ranking synonym can still be wrong when the audience, register, or grammar changes.
After choosing a replacement for "mysteriousness", read the sentence once for meaning and once for rhythm. The best synonym should feel natural in the full sentence, not only accurate in a word list.
If the synonym makes the sentence slower, vaguer, or more dramatic than intended, keep "mysteriousness" or choose a simpler alternative from the closest-match group.
OpenGloss and ConceptNet supply richer edges like generalizations, collocations, and derivations.
4 total sentences available.
1651, Jeremy Taylor, Twenty-Seven Sermons for the Summer Half-Year, Sermon II, Part II in ΕΝΙΑΥΤΟΣ: A Course of Sermons for All the Sundays of the Year, London: Tyler & Royston, 1668, p. 14, https://books.google.ca/books?id=heNBAQAAMAAJ&printsec=frontcover#v=onepage&q&f=false This may seem strange; and indeed it is so: and it is one of the great mysteriousnesses of the Gospel.
Source: wiktionary
This sort of mysteriousness, which is always so becoming in a hero, threw a fresh grace in Catherine's imagination around his person and manners, and increased her anxiety to know more of him.
Source: wiktionary
His children had urged him to travel: Mary Chivers had felt sure it would do him good to go abroad and "see the galleries." The very mysteriousness of such a cure made her the more confident of its efficacy.
Source: wiktionary
And all this is not changed by adding "mysterious" experiences to "manifest" ones, self-confident in the wisdom that recognizes a secret compartment in things, reserved for the initiated, and holds the key, O mysteriousness without mystery, O piling up of information! It, it, it!
Source: wiktionary
Closest matches include ambiguity, aura of mystery, eeriness, elfdom, enigmatic atmosphere.
Compare the replacement against real sentence context. This entry includes sample sentences so you can check tone, grammar, and meaning before swapping words.