smell wrong informal
smell fishy
smell odd

And sniff, of course; if the fish smells too fishy, don't buy it.

You know, this one smelled fishy from the beginning.

The boy took one look at her, declared that she smelled fishy, and wouldn't let her in his room.

For a guy with his sensitive nose, it would have smelled fishy.

The ocean was the color of rain, and the wind smelled fishy.

It smells very fishy to me, and I agree with your friend.

"Residents of Massachusetts are used to spending time near the ocean; we know when something smells fishy."

"Sadly, history has shown us that when something smells fishy it usually turns out to be rotten."

But the terms of that recovery smelled fishy to him, and he didn't mind saying so.

That may not have been Apple's intention, but it smells fishy.