ultrasecret.
ultraviolet.
ultramicroscopic, ultra-careful.
ultrasonic.
ultra-high definition video.
The slight that can be conveyed in a glance, in a gracious smile, in a wave of the hand, is often the ne plus ultra of art. – Julia Kavanagh.
Five militants were nabbed while four ultras of Harkat-ul-Jehad-e-Islami (HuJI) gave themselves up.
Acts of the Scottish Parliament, unlike Westminster, can be challenged in court on the basis that they relate to reserved matters and are, therefore, ultra vires.
... to create ultra-precise capacitors ...
... That average reader will have an ultra-powerful tablet. ...