metus

Metus, metus, m., is fourth declension and masculine, which puts it with exercitus and impetus rather than with the fourth-declension oddities manus and domus. Genitive singular metus is spelled exactly like the nominative, so the case has to come out of the syntax.

A genitive attached to metus is almost always objective: metus mortis is fear of death, not death's fear, and hostium metus is the fear the enemy inspire. Against timor, which is the feeling in the chest, metus leans towards apprehension of a definite danger, though writers swap them freely. The verb is metuo, and the adjective is not metuosus but metuendus, "to be feared" - the gerundive doing the work an adjective would do in English.