Is 'honest' a suitable synonym for 'sincere'?
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These are NOAD's versions of the terms:
As you see, the meanings of the two words intersect, but there are real points of difference in some of the senses. There are cases where you would not substitute one for the other. Sincere is hardly going to be understood to mean "simple, unpretentious, and unsophisticated" for example. And honest has more to do with veracity than feelings.
There are a number of shades of difference in the meaning. I'll just mention one that nobody has touched on so far: If you describe somebody as an honest man, this implies he is generally honest. If you describe somebody as being sincere, you are generally talking about a single instance of honesty.
You shouldn't say honest here, because it's only a single instance of honesty. If you want to use the word honest, you should say:
Depends on the context.
"Sincere" would not be a synonym in this construct.
"Sincere" may work here, but "honest" sounds better.
"Sincere" will work here, but it still sounds different from "honest".