i-adjective
faint; slight; vague; indeterminate; tinge of ...; touch of ...
Describes something subtle, barely perceptible, or not clearly defined. Often used for atmospheres, feelings, or qualities that are hard to pin down. The adverbial form そこはかとなく is more common.
See also: そこはかとなく
A faint loneliness could be felt in her words.
この部屋にはそこはかとなく懐かしい雰囲気がある。
This room has a vaguely nostalgic atmosphere.