The part of a sentence "changeable as a" is correct and usable in written English.
You can use this phrase to compare two things, to note that one thing is as "changeable" as (or similar to) the other. For example, you might say "The weather is as changeable as a mood" to note that the weather changes quickly, like a person's mood.
The weather looks as changeable as a toddler's tantrums.
"Nothing's as changeable as a young man's heart.
Musically, Mr. Colla's score is about as changeable as a piece can be, moving gradually from the sweet-toned ocarina passages to zany sections dominated by percussion to visceral, driven violin music and alluring flute melodies.
Because it is now spring, the master decides not to wear a scarf offered by his fussy retainer, who reprovingly remarks that "the weather is as changeable as a child's mood".
But the look of the grande dame we have come to know as Lady Justice — as interpreted by artists like Giotto, Brueghel and Reynolds — has been as changeable as a catwalk model's.
But, before the relevance of that to our own age of weapons of mass destruction can sink in, McGuinness has the same servant cry "the gods are as changeable as a child's arse" which is as vulgar as it is unfunny.
Gathering together a dozen or so artists in Turin, Milan, Rome, Genoa, Arte Povera – literally translated as "poor art" – used everyday materials to create sculpture, photos, installations and other works which were often ephemeral, or changeable, as well as to modern eyes surprisingly contemporary.
Moreover, taking the advantage of reconfiguration capability of such a technology and architecture we introduce a novel technique to design evolvable hardware where not only the logic functions are changeable (as is the case of the Field Programmable Gate Array, FPGA) but also the physical position of the components on the surface of the integrated circuit.
If ethics arises biologically, as naturalistic evolution holds, then it is inherently changeable, as are views on human dignity.
Hence, the findings of the hyperactivation in the occipital and temporal regions of the BD patients, only to the happy and angry faces but not to the sad and neutral faces, reflect that dysfunction of perceptual processing in the BD patients may be associated with detection of changeable as well as high-arousal facial features.
It is, perversely, also the most unpredictable, as changeable as an inclement day at the seaside.
