blithe

adj. 快乐的，无忧无虑的

blind date, blind spot, blind-man's buff, blinder, blinders, blindfold, blinding, blindly, blindness, blink, blinkered, blinkers, blinking, blip, bliss, blissful, blissfully, blister, blister pack, blisteringly, blithely, blithering, blitz, blizzard, bloated, bloater, blob, bloc, block, block and tackle, block diagram, block letter (also block capital), block vote (also card vote), block-buster, block-busting, blockade, blockage, blockhead, blockhouse, bloke,