“Obviously” or “clearly ... ”

These are passive-aggressive qualifiers in which the hostile tone contradicts their meaning.

When co-workers deploy these qualifiers in statements like, “Well, clearly, you know our company’s policy on this,” there is coded hostility, Howes said. “‘Why didn’t you know that? You should know better.’ That’s kind of the subtext there.”

A more tactful way to go is to point out to your co-worker, “Hey, you might not be aware,” or “Hey, not sure if you knew this."