What to say instead of “that's impossible”
Why it can fall flat
“that's impossible”
Listeners often hear “that's impossible” as a refusal to try or as a judgment that their request was foolish, because the real limit goes unstated. Name the constraint instead, whether it's time, scope or capacity.
Say this instead
- 01
I don't see a way to get this done by Friday with the current scope. If the deadline is fixed, which parts can we drop or move?
Boss · Chat
Use it when a deadline and scope clash, since it states the limit and asks your boss to decide on the trade-off.
- 02
I can't take this on this week. My plate is full, and I'd rather tell you now than miss it later.
Coworker · Chat
A last-minute ask suits this one because it is a clear no that gives the person time to look elsewhere.
- 03
Delivering all of this by the 12th isn't feasible with the current scope. If the date is fixed, the scope has to be reduced; if the scope is fixed, the date has to move.
Client · Email
Reach for it when a client wants everything by an unrealistic date, because the no stays firm and the two levers are named.
- 04
I can't approve this as it stands because the timeline doesn't hold up. Walk me through what's driving the date so we can look at it properly.
Someone you manage · Chat
This helps when someone you manage proposes an unworkable plan, since it rejects the plan without dismissing the person.
- 05
Unfortunately that isn't something our service can do. I'd rather tell you straight than leave you waiting on something that won't happen.
Customer · Chat
Fits a feature or request you can't meet, as it is direct and spares the customer false hope.
- 06
Thanks for thinking of me. A start date next month doesn't work on my side, so I'll need to pass on the role as it's described.
Recruiter / HR · Email
Timing that rules out an offer is the moment for this, because it declines politely without a long explanation.
- 07
I can't get the deck done by 9 tonight. It needs a few more hours. Can we talk about what's realistic?
Boss · SMS
Good for an urgent, short heads-up when you can't call, since it flags the limit early and opens a conversation.
Examples
Hi Anita, Thanks for the updated brief. Completing all twelve pages by Thursday isn't feasible with the current scope. If Thursday is fixed, we would need to limit this round to the first six pages; if you need the full set, the date would have to move. Let me know which you prefer. Best regards, Rowan
I can't take on the vendor review this week. I'm tied up with audit prep until Friday, so it would have to wait until Monday or go to someone else.
What to avoid
- Absolute words like “impossible” or “never” are a poor fit when you really mean “not by then” or “not with these resources”.
- Saying “I'll try” when you already know the answer is no only delays the bad news.
- Long, defensive explanations weaken the message, so give one clear reason and stop.
- A sarcastic or exasperated tone is easy to misread, especially in chat.
- Leaving the person with only a no is a missed chance when a fixed deadline or scope could still be adjusted.