"impressive speech" is grammatically correct and can be used in written English.
For example, “The Prime Minister's speech at the conference was very impressive.”.
Mr. Bush distinguished himself in the Capitol on Thursday night, with an impressive speech impressively delivered.
It was an impressive speech.
She made an impressive speech advocating a strong central government, police force and national army.
Ronald Reagan was an experienced politico when he delivered his impressive speech back in 1987.
As Mr Osborne said in an impressive speech, there is no such thing as a tax-cutting shadow chancellor.
Day two was given over to Obamarama: an impressive speech by one of the party's rising stars, Barack Obama.
I've pictured myself making impressive speeches in court.
About an hour before Ryan spoke, the two losing finalists in the veepstakes — Rob Portman and Tim Pawlenty — gave two of the least impressive speeches I can remember at a convention.
George's impressive speeches challenging the war in Iraq and plans to invade Iran have made him a hero to many, but his stance on issues such as abortion has meant that many have challenged his progressive credentials.
John Kampfner Daily Express, September 24 "This was one of Mr Kennedy's most impressive speeches but he still has some work to do to really shed the old image of 'champagne Charlie', of the decent bloke who cracks a good joke and enjoys a night out... Mr Kennedy told his audience the Lib Dems were moving from being a 'party of protest to a party of power'.
Some may scoff at the notion of abandoning Google's impressive speech-to-text functionality, but Swype's alternative is no slouch — it isn't as downright fast as Google's implementation but a few minutes of testing made it seem a bit more accurate.
