think·able 
/ˈθɪŋkəbəl/ adjective
not used before a noun /ˈθɪŋkəbəl/ adjective : capable of being thought about and done
▪ They divorced during a time when that was barely thinkable. — opposite unthinkable
▪ They divorced during a time when that was barely thinkable. — opposite unthinkable
