I’ve long wrestled to articulate what I sensed was a distinction between two vague words, promptly and substantial. Here’s my latest attempt:
Different vague words might pose different challenges. For example, in a given context the time constraints might be clear-cut enough so that there’s little room for dispute over what’s required for a party to act promptly. By contrast, a provision subject to a substantial standard might leave the parties wondering at what point along a spectrum from nothing to everything something has to be before it’s substantial.
That is all.