Ranked by relevance and common usage.
Keep "unfathomed" 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 "unfathomed" 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 "unfathomed", 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 "unfathomed" 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.
Youth is not less averse from change; but that is from exaggeration of its consequences, for all seems to the young so important, and so fatal. They are timid, because they know not what they fear; hopeful, because they know not what they expect. Despite their gayety of confidence, they yet dread the first plunge into life's unfathomed deep.
Source: wiktionary
As she told me, I was naught to her, and never shall be through the unfathomed depths of Time, unless, indeed, conditions alter, and a day comes at last when two men may love one woman, and all three be happy in the fact.
Source: wiktionary
“We must follow after this dreadnought, hard on her tracks. She shall not dodge me though she hide in unfathomed waters, or in the earth's bosom, or in lonely woods, or on crags!”
Source: wiktionary
Man does vvith dangerous Curioſity / Theſe unfathom'd VVonders try: / VVith fancy'd Rules and Arbitrary Lavvs / Matter and Motion he reſtrains, / And ſtudy'd Lines and fictious Circles dravvs; […]
Source: wiktionary
Closest matches include able, abysmal, abyssal, bottomless, cavernous.
Compare the replacement against real sentence context. This entry includes sample sentences so you can check tone, grammar, and meaning before swapping words.