I had no idea whether that was true, but it sounded plausible.

That doesn't sound very plausible - until you think about what she and I have in common.

That didn't sound very plausible, but I had to take the possibility into account.

And whatever she says, even if it sounds quite plausible.

And this may not sound very plausible, coming from me, but we think it should be given only by merit.

I couldn't think of a single answer that would sound plausible.

Because he thought it would sound more plausible than the truth.

"Or are you trying to manufacture a story that will sound plausible?"

It began to sound quite plausible, allowing for further development.

Until you stop to think about it, this kind of thing can sound plausible.