The price of residential properties cannot be estimated exactly because there are major upswings in the real estate sector of Chennai.

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The environmental disaster cannot even be estimated, as a human being would face deadly exposure levels of radiation within two minutes of entering the hot zones of the plant.

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"Ted Kennedy was a true and constant friend of the peace process in Northern Ireland whose huge influence in engaging the United States in that process cannot be over estimated, " he said.

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And, as with Pulis, Johnson believes that when it comes to a new signing the character of the player cannot be under-estimated.

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Today's jointly-authored article chooses to ignore the tensions and compromises between these goals, conceding only that the complexity and challenge cannot be under-estimated.

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The exact size of these industries can be estimated only vaguely, but their scope and impact cannot be denied.

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