coldish

cryogenic, subfreezing, subzero, ultracold

cutting, keen, penetrating, piercing, sharp

bracing, brisk, crisp, invigorating, rigorous

chilled, cooled, frosted, frozen, iced, refrigerated, unheated

bloodless, coldhearted, hard-hearted, heartless, kindless, pitiless, uncaring, unfeeling

reserved, soulless, undemonstrative, unemotional, unresponsive

apathetic, indifferent, unenthusiastic, uninterested

aloof, detached, dispassionate, impersonal, offish, standoffish

antisocial, unsociable, unsocial