Ranked by relevance and common usage.
Keep "unbased" 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 "unbased" 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 "unbased", 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 "unbased" or choose a simpler alternative from the closest-match group.
4 total sentences available.
We have the feudal state in the gloomy and Gothic grandeur of Northumberland House; we pass along the Strand, where Jack Cade pursued his brief triumph—the prototype of every popular insurrection unbased on any great principle—sudden, cruel, and useless!
Source: wiktionary
To revive questions supposed to be long since settled, may be thought to need some apology; but there is a sufficient apology in the implication above made clear, that the theory commonly accepted is ill-based or unbased.
Source: wiktionary
Such stumbling and unbased coincidences are often cited as indicative of some supernatural source of knowledge possessed by children and persons of the genius type; but if the unbased statements made of such persons the world over should be placed in one list, and the facts as later determined to be true should be placed in another, it seems that the laws of coincidence would govern the situation completely.
Source: wiktionary
But the strangler's disquiet proved unbased. The snarl opened its jaws and Shelyid popped out, none the worse for wear.
Source: wiktionary
Closest matches include baseless, empty, groundless, idle, unfounded.
Compare the replacement against real sentence context. This entry includes sample sentences so you can check tone, grammar, and meaning before swapping words.