That cannot be adopted; unsuitable for adoption.(adjective)
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Use "unadoptable" in a sentence
""challenged and so-called unadoptable" animals to schools to teach reverance for life..."
"Instead, they changed their minds within a year, passed him on to another white family and he ended up shipped back to New York, labeled "unadoptable" and placed ultimately in a modern day orphanage in a prosperous community."
"Later, when the crew filmed the makeover of the home of Billy Jack and Anne Barrett, who were raising children considered "unadoptable," they invited him to the job site in Peyton, east of Colorado Springs."