India, Aug. 4 -- Euro area investor confidence deteriorated unexpectedly in August as the newly reached trade deal with the U.S. deepened concerns about the current economic situation as well as the outlook, data from the behavioral research institute Sentix showed on Monday.

The Sentix investor sentiment index fell steeply to -3.7 in August from 4.5 in July. The measure was expected to climb to 6.2.

The current situation indicator declined sharply to -13.0 from -7.3. Likewise, the expectations index plunged to 6.0 from 17.0 in the previous month.

The Sentix survey was the first to assess the U.S.-EU trade agreement and the deal is proving to be a real mood killer, the think tank said.

The think tank said, "The U.S. and Donald Trump may...