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

The dawn that imbues and enkindles Life's fluctuant and fugitive sea Dies down as the starshine that dwindles And cares not to be.

From A Channel Passage and Other Poems Taken from The Collected Poetical Works of Algernon Charles Swinburne—Vol VI by Algernon Charles Swinburne

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

Sometimes at our feet, beneath the seamy fissures of a hillside, or far removed by sweep of meadow, lay the fluctuant mass we call the sea.

From In and out of Three Normady Inns by Anna Bowman Dodd

Along her sensitive, fluctuant nostrils the casual crinkle of distaste and suspicion had deepened suddenly into sheer dilating terror.

From The White Linen Nurse by Eleanor Hallowell Abbott