Failing to interest; usually used in response to something that was presented as exciting.The dinosaur island in Crystal Palace Park is underwhelming.
1990, July 13, Rita Kempley, ‘Quick Change’ (R), Davis, plush as ever, is a little whiny and underwhelming as Murray's girlfriend, who spends much of her time nurturing Quaid, doing his familiar sweet-natured lummox.
2005, August 17, Edward Wyatt, Sales Lag for Book on Deep Throat, But in Washington and just about everywhere else, sales of "The Secret Man," Bob Woodward's story of the source known as Deep Throat, have been underwhelming.