like water off a ducks back

like water back idiom water-resistant unaffected resilience impervious untroubled undisturbed unbothered carefree unresponsive criticism easygoing nonchalant calm demeanor composed imperturbable indifferent troubles unconcerned unflappable unmoved unshaken unswayed unworried cool pressure negativity unruffled impassive unimpressed unemotional aloof stoic nonreactive detached attitude challenges rain pond duck natural elements aquatic environment raindrops surface ripples hydrological cycle rainwater nature falling habitat feathers droplets shower ecosystem wildlife waterproofing scene wild features water-repellent