Ranked by relevance and common usage.
Keep "unfailing" 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 "unfailing" 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 "unfailing", 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 "unfailing" or choose a simpler alternative from the closest-match group.
OpenGloss and ConceptNet supply richer edges like generalizations, collocations, and derivations.
7 total sentences available.
The oligarchic character of the modern English commonwealth does not rest, like many oligarchies, on the cruelty of the rich to the poor. It does not even rest on the kindness of the rich to the poor. It rests on the perennial and unfailing kindness of the poor to the rich.
Source: tatoeba (410290)
Man's unfailing capacity to believe what he prefers to be true rather than what the evidence shows to be likely and possible has always astounded me. We long for a caring Universe which will save us from our childish mistakes, and in the face of mountains of evidence to the contrary we will pin all our hopes on the slimmest of doubts. God has not been proven not to exist, therefore he must exist.
Source: tatoeba (1463038)
What an unfailing barrier against vice, immorality and bad habits are those tastes which lead us to embellish a home, to which at all times and in all places we turn with delight, as being the object and the scene of our fondest cares, labours and enjoyments; whose humble roof, whose shady porch, whose verdant lawn and smiling flowers all breathe forth to us, in true, earnest tones, a domestic feeling that at once purifies the heart and binds us more closely to our fellow beings.
Source: tatoeba (3496609)
Unfailing love does not exist.
Source: tatoeba (6796011)
Showing 4 of 7 available sentences.
Closest matches include abiding, assiduous, bulletproof, calculable, ceaseless.
Compare the replacement against real sentence context. This entry includes sample sentences so you can check tone, grammar, and meaning before swapping words.