capricious

changeable

Governed or characterized by caprice; apt to change suddenly; freakish; whimsical; changeable.

Latin 'capricornus' (like a goat's unpredictable leap)

“I had to decide whether we took a hero or an author, which I soon learnt to do with capricious resolution.”

— George Meredith, Complete Project Gutenberg Works of George Meredith

Ayodele, a weather forecaster in Matteo Soledad, promised sunshine for his daughter's picnic. But the capricious sky had other plans, dumping rain as if it were a goat leaping unpredictably from cloud to cloud, drenching Ayodele’s dreams and turning the day into a soggy splash fest.

At a bustling market in Casablanca, Amara watched as the vendor suddenly snatched back her favorite scarf just as she reached to touch it, declaring another was better; his capricious nature left her head spinning amidst the vibrant stalls.

“The Grutas de Rancho Nuevo Ecotourism Center is centered on a set of caves in which appear capricious forms of stalagmite and stalactites.”