I think that it likely that there was a major fault in the lookout.

They also teach that, for great sins, they cannot receive forgiveness unless they confess to their leader.

Were a serious crisis to arise, the government would have to act swiftly.

I am going to make him a serious offer.

Carelessness was looked on as a serious defect.

She's guilty of a grave blunder.

She showed her regret over the serious mistake.

She indicated that the problem was serious.

They made much of what they saw.

Their decision will bring about serious consequences.

He showed courage in the face of great danger.

He attached great importance to the event.

He committed a serious crime.

He made an important discovery.

He was given an important mission.

He made a grave mistake.

He made a grave mistake.

He has made a significant decision.

He attached great importance to the event.

He soon comprehended the significance of her words.