Speaking clearly is a form of respect.

Making yourself understood is work you do so that others do not have to. Vague speech transfers the effort to the listener, who now has to interpret, guess, and check, and doing that consistently tells people their time is worth less than yours even if you never intended it.

Before a request or a message, ask whether the other person will know exactly what you mean and what you want. Say the specific thing rather than the approximate one. It takes an extra moment and it is a small, real kindness repeated many times a day.