Tom was now holding forth hotly upon the "onparalleled [sic] rascality and treachersome villainousness" of the Opposition in the Ontario Legislature. Elizabeth, her eyes alight, ran swiftly past the gate towards her father.
Source: wiktionary
Ranked by relevance and common usage.
Keep "treachersome" 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 "treachersome" 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 "treachersome", 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 "treachersome" or choose a simpler alternative from the closest-match group.
4 total sentences available.
Tom was now holding forth hotly upon the "onparalleled [sic] rascality and treachersome villainousness" of the Opposition in the Ontario Legislature. Elizabeth, her eyes alight, ran swiftly past the gate towards her father.
Source: wiktionary
I do wish you'd come away, Princey ! ” said the little girl anxiously. “I b'lieve he's one of those treachersome dogs that you never know what they mean ― There!
Source: wiktionary
Ko-kosh was treachersome but I could outwit his kind. I kept a close watch. He stole back my knife but I got it again. I wanted a gun. I couldn't come south without I had a gun and I couldn't hunt my food. We went north on the Lake of the Hurons.
Source: wiktionary
Kid Curry dismounted. “Stay put whilst I shed some light on the subject. The clay footing around here is sort of treachersome when it's this wet. [...]”
Source: wiktionary
Closest matches include treacherous.
Compare the replacement against real sentence context. This entry includes sample sentences so you can check tone, grammar, and meaning before swapping words.