(a.) Depleted of vitality; exhausted; no longer productive; infertile\; no longer capable of producing young, as an animal, or fruit, as the earth; hence, worn out with age; exhausted of energy; incapable of efficient action; no longer productive; barren; sterile.

ablated all in anemic arid asthenic ausgespielt barren blah blank bleary bloodless bootless burned-out burnt up characterless chicken cold colorless coming apart consumed counterproductive cowardly cracking crumbling dead debilitated decadent decayed decaying declining degenerate depleted deteriorating devitalized disabled disintegrating dismal dissipated dissolute done done in done up draggy drained draining drearisome dreary drooping droopy dry dryasdust dull dusty dwindling eaten up ebbing elephantine emptied empty enervated enfeebled eroded etiolated eviscerated exhausted fade fading failing faint faintish falling far-gone fatigued fatuitous fatuous feckless feeble finished flabby flaccid flagging flat floppy fragmenting frazzled fruitless futile going to pieces gone gutless heavy ho-hum hollow imbecile immoral impotent impoverished inadequate inane incapacitated ineffective ineffectual inefficacious inexcitable infecund infertile inoperative insipid invalid jaded jejune laid low languid languishing languorous leaden lifeless limber limp listless low-spirited lustless marcescent marrowless nerveless nugacious nugatory of no force out overripe pale pallid pedestrian pining pithless played out plodding pointless poky ponderous pooped powerless regressive retrograde retrogressive rubbery run-down sapless sapped shotten shriveling sinewless sinking slack sliding slipping slow slumping soft solemn spent spineless spiritless sterile stiff stodgy strengthless stuffy subsiding superficial tabetic tasteless tedious tired unavailing unfruitful unhardened unlively unnerved unstrung used up useless vain vapid waning washed-out wasted wasting weak weakened weakly wilting withering wooden worn worn away worn-out worsening