nothing less than

nothing less than (something)

(Having) an extreme quality, trait, or characteristic demonstrated in absolute terms. This meal is nothing less than sublime. The instructor demands nothing less than perfection from her pupils.
See also: less, nothing
Farlex Dictionary of Idioms. © 2015 Farlex, Inc, all rights reserved.

nothing less than

used to express how extreme something is.
1990 Katherine Frank Emily Brontë Nothing less than the ultimate feminine destiny of marriage had been within her reach, and Charlotte had almost immediately spurned it.
See also: less, nothing
Farlex Partner Idioms Dictionary © Farlex 2017

ˈnothing less than

(used for emphasis) very; completely: Their defeat was nothing less than amazing.Her survival was nothing less than a miracle.
See also: less, nothing
Farlex Partner Idioms Dictionary © Farlex 2017
See also:
References in classic literature ?
It was quite bitter enough, she felt, that he did not come to her, but now that she had made that advance, she felt that any withdrawal on his part would, to a woman of her class, be nothing less than a flaming insult.
"Certainly," I replied with inane promptitude, for I had no notion of her drift; but then she ran off in a scurry of laughter, and still puzzled I turned into my room, TO FIND, neatly hung over the end of the bed, nothing less than the dainty petticoat and silk stockings of Sylvia Joy.
With its daring imagery, grave magnificence of language and solemn thought, it is nothing less than Elizabethan, and only the masters of that age could have done it justice in the rendering.
Expecting nothing less than to be murdered on the spot she covered her eyes with her hands to avoid the sight of the descending axe.
With a shriek of fear the ape which held me leaped through the open window, but its mate closed in a terrific death struggle with my preserver, which was nothing less than my faithful watch-thing; I cannot bring myself to call so hideous a creature a dog.
Were the pictures which have been drawn by the political jealousy of some among us faithful likenesses of the human character, the inference would be, that there is not sufficient virtue among men for self-government; and that nothing less than the chains of despotism can restrain them from destroying and devouring one another.
Nothing less than a persuasion of universal depravity can lock up the charity of a good man; and this persuasion must lead him, I think, either into atheism, or enthusiasm; but surely it is unfair to argue such universal depravity from a few vicious individuals; nor was this, I believe, ever done by a man, who, upon searching his own mind, found one certain exception to the general rule." He then concluded by asking, "who that Partridge was, whom he had called a worthless fellow?"
In plainer terms still, this anxious matter meant nothing less than the possibility that she might again become a mother.
The subject speaks its own importance; comprehending in its consequences nothing less than the existence of the UNION, the safety and welfare of the parts of which it is composed, the fate of an empire in many respects the most interesting in the world.
Their eyes were immediately wandering up in the street in quest of the officers, and nothing less than a very smart bonnet indeed, or a really new muslin in a shop window, could recall them.
Solitude under such circumstances being not to be thought of, Volumnia is attended by her maid, who, impressed from her own bed for that purpose, extremely cold, very sleepy, and generally an injured maid as condemned by circumstances to take office with a cousin, when she had resolved to be maid to nothing less than ten thousand a year, has not a sweet expression of countenance.
Summary: Mumbai (Maharashtra) [India] July 31(ANI): Bollywood's fresh face Janhvi Kapoor looked nothing less than regal at the Vogue Beauty Awards held in Mumbai on Tuesday night.
The desi version of 'Colours' is nothing less than a treat for Pakistani fans of the game.
In online messages he sent to an MI5 spy, Rahman said his objective was "nothing less than the death of the leaders of Parliament", jurors were told.
He said: 'Now that he has from the blues decided to honour Chief Abiola who won the freest and fairest election in our history, the world expects nothing less than a free, fair and credible election from Buhari come 2019.