"still seldom" is correct and usable in written English.
You can use it when you want to express that something is continuing to take place infrequently or has not changed from being infrequent. For example, "Although the pandemic has caused many issues, people still seldom go outside."
And inside the courtroom, she sits stone-faced and still, seldom reacting to anything the witnesses say.
In fact, it's wandering still; seldom has an actor gotten more comedic mileage out of a vacant look than Mr. Wells does here.
Though the play made pointed use of sexual and ethnic words that are still seldom heard in polite discussion, these elicited far more giggles than gasps.
Still, seldom has a week passed in the last few months when a House or Senate Democrat, fearful of the outcome in the midterm elections, has not switched parties or retired.
A wren (twice the bulk of a goldcrest, but still seldom heavier than a pound coin) looses off a blistering volley of song from the hedgerow to my right.
At Carnegie Hall this season comes what it calls a "Focus on Stravinsky": a good way to mark the end of the century he so dominated and an opportunity to get to know pieces that are still seldom performed.
But this is still too seldom said.
And stranger still how seldom we encounter them in places like the theater or the novel.
IN THE rich world, AIDS, though still incurable, seldom nowadays means imminent death, and malaria kills hardly anyone.
Still, he seldom loses his extraordinary gift for displays of bravado, on show again last week, when he said he was sorry about an interest rate rise of 0.25 percentage points, the ninth in five years and the fifth since the last election, despite assurances at the last election that his government would maintain record low interest rates.
The BIM-based software-packages that would fully support and enhance the integrated, interdisciplinary planning practice and life-cycle data integration are still rather seldom.
