improlific
adjEtymology From im- + prolific.
1
Obsolete not prolific
- […]though he had so strong a brain and body, yet he lived and died childless, inter-commoning therein with many Worthies, who are, according to Elius Spartianus, either improlific, or have children in genitorum vituperium et famarum Icesuram.1662, Thomas Fuller, History of the Worthies of England: