adj. 25B6; adjective
Alex felt tired and sluggish : LETHARGIC, listless, lacking in energy, lifeless, inert, inactive, slow, torpid, languid, apathetic, weary, tired, fatigued, sleepy, drowsy, enervated; lazy, idle, indolent, slothful, sluggardly; Medicine asthenic; N. Amer. logy; informal dozy, dopey.
the economy is sluggish : INACTIVE, quiet, slow, slack, flat, depressed, stagnant.
vigorous.