Like some poor devils ashore that happen to know an irascible great man, they make distant unobtrusive salutations to him in the street, lest if they pursued the acquaintance further, they might receive a summary thump for their presumption.

These include HIDEX, a bathyphotometer, which is the U.S. Navy standard for measuring bioluminescence in the ocean, and a remotely operated camera system, known as Eye in the Sea (EITS), an unobtrusive deep-sea observatory.

A blind stamp is often unobtrusive, and careful inspection may be necessary to establish its presence.

A mobile guerrilla force unit was inserted into its assigned tactical area of operations by the most unobtrusive means available.

He was singularly unobtrusive, and avoided conflicts.