1.
warmth; friendliness; sociability
a quality of warmth or friendliness in one's manner; almost always used in the negative form 素っ気ない to mean cold, curt, or unfriendly
Almost exclusively used in the negative form 素っ気ない (curt, cold, unfriendly) or as the adverb 素っ気なく. The positive form 素っ気 alone is rarely used. Describes a manner of speaking or behaving that lacks warmth or interest.