The phrase "seemingly unchanged" is grammatically correct and can be used in written English.
It is typically used to describe something that appears to be unchanged on the surface but may have undergone some subtle or hidden changes. Example: Despite the passing of years, the old abandoned house stood seemingly unchanged, as if frozen in time.
From the street, the house is seemingly unchanged and so unassuming it almost disappears.
In both instances, there is a twilight when everything remains seemingly unchanged.
Haydee, the old woman of the house, was still there, even more ancient but seemingly unchanged.
We sit in a booth with plastic seats by a porthole window looking out onto the sound, the place seemingly unchanged since the 1970s.
Of course it's Al Green, seemingly unchanged by any trend, who owns this moment; he remains the beacon to which everyone else on "Lay It Down" genuflects.
The glass bottle, seemingly unchanged, no longer holds "35 doses for 35 cents," but Fletcher's familiar signature appears on the box.
But in rural provinces, a troubling number also described vicious hate crimes and places where the rules of apartheid seemingly remain unchanged.
The strip and the names on the back may have changed but Sydney FC's ability to turn in performances of almost comedic proportions seemingly remains unchanged from seasons past.
At 0600 UTC August 31, the depression was seemingly appeared unchanged, with winds of averaging about 35 mph (55 km/h).
"Alan Richardson bowled unchanged and seemingly inexhaustibly through Kent's innings, hitting line and length and hypnotising the batsmen with movement off the pitch.
Arched harps were prominent in ancient Central Asia, and 1st-century frescoes (Gandhāra culture, in modern Pakistan) show a seemingly archaic variety that survives almost unchanged in the vaji, or Kafir harp, of Nūrestān in Afghanistan.
