unfused 
adjective
Not fused or joined.Due to an unfused vertebra in his back, he was classified 1-Y, meaning he would only be called up in the event of a full-scale war or an emergency....
- You took letters and an X-ray to your draft board because you had an unfused vertebra in your back, but then you went skiing the next year.
- The flowers of the species are bisexual and protogynous, producing on average 13 unfused uniovulate carpels.