Well folks, let's have a little chinwag about the word 'grumble'. You know, that charming word we use when we're slightly miffed but not quite ready to unleash the inner Hulk. So, what's another word for grumble? Drumroll please... it's 'murmur'! Yes, ladies and gents, 'murmur' is like grumble's slightly more sophisticated cousin, all suave and subtle. So next time you're on the verge of a grumble, why not try a murmur instead? Keep the complaints classy, my friends!