Posthaste, also spelled post-haste, is an adverb that means “with the greatest possible speed or promptness.” It works in a sentence similar to immediately or ASAP. When the term entered English, it referred to speed like that of someone traveling post, or riding express to deliver mail. Nowadays you can use it to command speedy movement or action, “Leave the premise posthaste!” or to describe it, “She came to her friend’s aid posthaste.”

Something that is boring is dull and uninteresting—maybe even nap inducing. Something that is humdrum is especially boring for its lack of variety (unlike your synonym-rich vocabulary!). Fun though it may be to say, humdrum emphasizes monotony and the drone of the everyday. This dreary adjective commonly describes recurring activities or routines, or even the monotony of life itself.

To helm something, such as a creative project or a place of business, is to steer or direct it. The suggestion is of one helming or steering a ship, an activity so named for the wheel or steering apparatus of a seagoing vessel—the helm. You may hear of someone helming a department or agency, a newsroom, or a kitchen in popular restaurant. But most often, helm is used in the entertainment industry in discussion of the director, who steers the production on a (hopefully not choppy) course.