It's Doubtful that they knew this though.
Abstain from whatever is Doubtful!
The connection is Doubtful.
And indeed it is Doubtful.
The policemen were Doubtful.
Doubtful that he was a Muslim.
I'm Doubtful of the second.
All this is to me very Doubtful.
I'm Doubtful of the latter.
Doubtful about climate change?
It is Doubtful you will stumble into success.
It's Doubtful he'll live.
I know you're still Doubtful.
I know you're Doubtful about this.
Then, why am I Doubtful about this?
The death of the last one is Doubtful.
It's Doubtful if people will risk their lives
Both figures are Doubtful.
neither be ye of Doubtful mind.
Habitually Doubtful person.
Doesn't this make people more Doubtful about God's existence?
Being excessively worried, afraid, or Doubtful about the future.
Preset contraptions and the audio excellent is always Doubtful.