longstanding

[ lawng-stan-ding, long- ]

/ ˈlɔŋˈstæn dɪŋ, ˈlɒŋ- /

existing or occurring for a long time: a longstanding feud.

Origin of longstanding

First recorded in 1595–1605; long¹ + standing

enduring, lasting, long-lasting.

Around half the Baluch in the province are unemployed, a result, say rights groups, of longstanding marginalization by Tehran.

The Dangerous Drug-Funded Secret War Between Iran and Pakistan |Umar Farooq |December 29, 2014 |DAILY BEAST
But in 1969, a longstanding practice was challenged—its ban on women.

The Bars That Made America Great |Nina Strochlic |December 28, 2014 |DAILY BEAST
So maybe we should take a lesson from women with brass ovaries: comedy and feminism are longstanding bedfellows.

Comedians and Feminism Getting Laughs |Agunda Okeyo |October 23, 2014 |DAILY BEAST
From Joan Rivers to Marlo Thomas to Lena Dunham, comedy and feminism have been longstanding bedfellows.

Comedians and Feminism Getting Laughs |Agunda Okeyo |October 23, 2014 |DAILY BEAST

But I suppose a kind of longstanding love of specific bands would be Radiohead, Wilco, Neil Young, Tom Waits, REM.

Toni Collette on ‘The Realistic Joneses,’‘Lucky Them,’ and Crying in ‘The Sixth Sense’ |Melissa Leon |June 1, 2014 |DAILY BEAST
An infusion of fresh blood is sometimes the best remedy for longstanding disease and weakness, especially in social organizations.

The Atlantic Monthly, Volume 14, No. 81, July, 1864 |Various
Not only longstanding but impromptu engagements preclude this sacrifice.

Manners and Rules of Good Society |Anonymous
Lambert never had taken part in that longstanding competition.

The Duke Of Chimney Butte |G. W. Ogden
Nor did he excuse himself on the ground that the massacre was the fulfilment of the longstanding sentence on Elis house.

The Expositor's Bible: The First Book of Samuel |W. G. Blaikie
A longstanding quarrel with Macready resulted in the tragedian assaulting the manager.

Encyclopaedia Britannica, 11th Edition, Volume 4, Part 4 |Various