(a.) Not easily aroused or excited; dull; impassive\.

aloof apathetic arid at rest barren blunt bored bovine calm careless cloistered cool dense detached disinterested dispassionate distant doltish dry dull dumb dwindling earthbound ebbing even-tempered even-tenored fact halcyon heedless hushed impassive imperturbable inactive incurious indifferent inert inexcitable infecund infertile inirritable insouciant isolated lethargic listless literal lumpish mindless moldering mundane obtuse pacific passive patient peaceable peaceful phlegmatic placid prosaic prosing prosy quiescent quiet regardless reposeful reposing restful resting secluded sequestered sequestrated sheltered slow smooth staid steady still still as death stillish stilly stoic stuffy stupid subsiding supine thick tranquil unagitated unconcerned undisturbable undisturbed unemotional unfanciful unflappable unideal unimaginative uninquiring uninspired uninterested uninventive uninvolved unirritable unmindful unmoved unnervous unoriginal unpassionate unperturbed unpoetic unromantic unromanticized unruffled unstirring untroubled waning withdrawn wooden