Her reasons for leaving were 'obvious'. = It's 'obvious' why she left.
You are stating 'the obvious'. Tell me something I don't already know.
Her doctor immediately noticed the 'obvious' signs of the disease.
(..) ''Hum, nice to see you again. Hum, oh, pardon me, hum.'' You know, very smooth people, you know. So then, of course, the obvious one is the wino, but see, winos, once they get down to where they cannot walk anymore, you know, they just kind of heel-toe it, you know... (..)1983 Bill Cosby: Himself