Having a long face; hence, having a sober, sad, or rueful face or visage.
The Century Dictionary (Public Domain)
Use "long-visaged" in a sentence
"They are long-visaged, and of a very unpleasing aspect, having no one graceful feature in their faces."
"The face of the _blasé_ theatre-goer shines when his play is announced for the evening; and even the long-visaged critic, fond of talking of the _décadence_ of the modern stage, has been known to appear punctually in his seat when Tom Taylor's play was to lead off the performance."
"Look at plants that grow without sun, -- wan, pale, long-visaged, holding feeble, imploring hands of supplication towards the light."