The Collaborative International Dictionary
Seasonless \Sea"son*less\, a. Without succession of the seasons.
Wiktionary
a. 1 Without seasons. 2 (context fashion English) Not restricted to a particular season, but suitable for any.
Usage examples of "seasonless".
He had spent decades, and his people had lived for many millennia, in the seasonless and warm Underdark.
It was springtime above, though the dark elves, in their seasonless environs, knew nothing of that, and the air was full of the scents of new-blossomed flowers and budding trees.
In the soft, seasonless mists of her home world, natural selection had not been inspired to evolve keen eyesight.
But in this seasonless tropical forest, perpetually abundant, there was no need for their breeding cycles to be synchronized.
By Terran standards, World was a generous planet: fertile, warm, seasonless, plentiful.
Fourth of July, coincidentally high summer in the northern hemisphere of Mars, though the wild slopes of Olympus Mons were still white with seasonless snow.
Their charismatic, caustic, and homely voices punctuated the seasonless Berkeley days and nights.
Pallol One-Eye nodded, he who had seen 600 winters upon his own far world and more than a thousand orbits of the nearly seasonless Pliocene Earth.
These gardens were timeless, seasonless, as close to eternal paradise as Cyra could imagine.
Imperial Guard, whose forces dwelt in seasonless ship-holds plying the ever-cold of space, made no such distinction between campaigning months and resting months.