gratuitous

adj. 无缘无故的，免费的

grass, grass roots, grass snake, grass widow, grass-seed, grasshopper, grassland, grassy, grate, grateful, gratefully, grater, gratification, gratify, gratifying, gratifyingly, grating, gratingly, gratis, gratitude, gratuitously, gratuitousness, gratuity, grave, gravel, gravelly, gravely, graven, graven image, gravestone, graveyard, graving dock, gravitate, gravitation, gravitational, gravity, gravy, gravy train, gravy-boat, gray,