Ranked by relevance and common usage.
Keep "dreamless" 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 "dreamless" 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 "dreamless", 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 "dreamless" 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.
He watched over her slumber for some time, but Nature proved to be too strong for him. For three days and three nights he had allowed himself neither rest nor repose. Slowly the eyelids drooped over the tired eyes, and the head sunk lower and lower upon the breast, until the man's grizzled beard was mixed with the gold tresses of his companion, and both slept the same deep and dreamless slumber.
Source: tatoeba (6310893)
Tom fell into a deep dreamless sleep.
Source: tatoeba (10326030)
She spent the night in a deep and dreamless sleep.
Source: wiktionary
Old Yew, which graspest at the stones That name the under-lying dead, Thy fibres net the dreamless head, Thy roots are wrapt about the bones.
Source: wiktionary
Closest matches include und dreamt, undreamed, undreaming.
Compare the replacement against real sentence context. This entry includes sample sentences so you can check tone, grammar, and meaning before swapping words.