Adjective

(en adjective)

Easily discovered, seen, or understood; self-explanatory.

*

*:Carried somehow, somewhither, for some reason, on these surging floods, were these travelers, of errand not wholly obvious to their fellows, yet of such sort as to call into query alike the nature of their errand and their own relations. It is easily earned repetition to state that Josephine St. Auban's was a presence not to be concealed.

*{{quote-magazine, date=2013-08-17, volume=408, issue=8849, magazine=(The Economist)

, title= Down towns , passage=It is not obvious , to economists anyway, that cities should exist at all. Crowds of people mean congestion and costly land and labour. But there are also well-known advantages to bunching up. When transport costs are sufficiently high a firm can spend more money shipping goods to clusters of consumers than it saves on cheap land and labour.}}

Adjective

(er)

Hard to grasp; not obvious or easily understood; barely noticeable.

The difference is subtle , but you can hear it if you listen carefully.

(of a thing) Cleverly contrived.

(of a person or animal) Cunning, skillful.

insidious

* 1623 , , act iv, scene 4,

Thy age confirmed, proud, subtle , bloody, treacherous.

Tenuous; rarefied; of low density or thin consistency.