aimless barren bootless carefree careless counterproductive easygoing effete empty etiolated fatuitous fatuous fruitless fustian futile good-for-nothing grasshopper happy-go-lucky heedless impotent improvident inadequate inadvertent inane incautious ineffective ineffectual inefficacious inoperative invalid irresponsible lackadaisical meaningless negligent no go nonchalant nugacious nugatory of no force of no use pointless purposeless reckless remiss shiftless sterile superfluous thoughtless thriftless unavailing uncaring undependable uneconomical unheeding unproviding unpurposed unreflective unreliable unthinking unthrifty untrustworthy useless vain wild worthless wrecking