All efforts have been unavailing.
Source: tatoeba (1585211)
Ranked by relevance and common usage.
Keep "unavailing" 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.
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5 total sentences available.
All efforts have been unavailing.
Source: tatoeba (1585211)
By this I reached the roof-top, whence in vain / the luckless Teucrians hurled their unavailing rain.
Source: tatoeba (6831102)
Weeping she spake, with unavailing woe, / and poured her sorrow to the winds, when lo, / in sight comes Helenus, with fair array, / and hails his friends, and hastening to bestow / glad welcome, toward his palace leads the way; / but tears and broken words his mingled thoughts betray.
Source: tatoeba (7052951)
The Begums' ministers, on the contrary, to extort from them the disclosure of the place which concealed the treasures, were, […] after being fettered and imprisoned, led out on to a scaffold, and this array of terrours proving unavailing, the meek tempered Middleton, as a dernier resort, menaced them with a confinement in the fortress of Chunargar. Thus, my lords, was a British garrison made the climax of cruelties!
Source: wiktionary
Showing 4 of 5 available sentences.
Closest matches include futile, ineffectual, abortive, aimless, barren.
Compare the replacement against real sentence context. This entry includes sample sentences so you can check tone, grammar, and meaning before swapping words.