Most difficult marriages were visible early. Not through anything dramatic — through small things that were noticed, mentioned to nobody, and explained away.
Here are the ones people most often describe afterwards.
They answer a different question
You ask something specific and get something adjacent. You ask again and get a longer version of the same evasion. Done once it is nerves. Done consistently it is a habit, and it does not improve after marriage.
Nobody is ever at fault
Every previous relationship ended because of the other person. Every job ended because of a bad manager. Every family disagreement was someone else's doing.
Listen for whether anyone is ever allowed to be partly right.
They are different with staff
Warm with you, curt with the waiter. This is the single most reliable signal available in a first meeting, and it is completely free to observe.
The family answers for them
An adult who cannot speak about their own plans, work or preferences without a parent supplying the answer is telling you how decisions will be made in your house.
Deference to parents is normal and often admirable. Having no voice at all is a different thing.
There is pressure about time
An artificial deadline, usually presented as circumstance. A visa, a posting, a relative's health. Sometimes these are real. But urgency that appears whenever you ask for time to think is not about a calendar.
Something does not match
The job description shifts slightly. The age is corrected. A first marriage is mentioned late and casually. Small inconsistencies rarely stand alone — they are usually the visible part of something larger.
They dismiss what matters to you
You mention something important — your work, your family, a plan — and it is waved away as something that will change after marriage. It is worth asking directly whether they expect it to.
What to do about any of this
Not walk away immediately. One observation is not a pattern, and first meetings make everyone strange.
But write it down. The reason these signs get missed is not that people fail to notice them. It is that by the third meeting, when everyone is invested and families are hopeful, the early doubt has been quietly rewritten as nerves.
Almost everyone who describes a bad marriage can name the moment they first felt it, and it is almost always in the first two meetings.
And the opposite
The good signs are just as quiet. Someone who asks you questions and listens to the answers. Someone who says "I don't know" without discomfort. Someone who mentions a difficulty in their family plainly rather than hiding it.
Those are worth noticing too, and people rarely do.