cloudless

Mane (Îngilîzî)

Without any clouds.

Berevajî

clouded, cloudy

Hevwate

clear

unclouded

bright

serene

sunny

☀️

fair

net

plain

pure

sheer

smokeless

spick-and-span

unshadowed

azurine

cerule

azureous

azured

azure

azurn

blank

cerulean

clean

cleanly

neat

Werger

wolkenlos

sans nuages

serè

sin nubes

unbewölkt

sereno

dégagé

αίθριος

despejado

azurblau

himmelblau

wolkenfrei

azur

atzur

Etîmolojî (Îngilîzî)

Ji Middle English mîras hatiye girtin: cloudeles

In summary

From Middle English cloudeles, equivalent to cloud + -less.