fluctuant

The result was an unflattering portrait that emphasized "strong, although fluctuant, emotional attachments" and "sudden and extreme shifts in loyalty and enthusiasm."

From Time Magazine Archive

Just now, therefore, Francis Lingen flowed murmuring on his way, like a purling brook, rippling, fluctuant, carrying insignificant straws, insects of the hour, on his course, never jamming, or heaving up, monotonous but soothing.

From Love and Lucy by Maurice Henry Hewlett

In the middle of the camp Daddy John's fire flared, the central point of illumination in a ring of fluctuant yellow.

From The Emigrant Trail by Geraldine Bonner

With fluctuant blackness against immutable blackness great sweeping pine trees swished weirdly into the horizon.

From Peace on Earth, Good-will to Dogs by Eleanor Hallowell Abbott

From time to time some one appeared clambering over heads and shoulders to make a desperate lunge and snatch at the flowers, and then fall back into the fluctuant heap again.

From April Hopes by William Dean Howells