'lacklustre' is correct and usable in written English
You can use it to refer to something or someone that lacks enthusiasm or energy. For example, "The team gave a lacklustre performance in the first half of the game, but they managed to turn it around in the second half."
Ancelotti was forced to make a change when Gregory van der Wiel came on for the injured Christophe Jallet in the 27th minute but it was not until after the break that his side were punished for their lacklustre performance by Jonas's fine strike.
Compared with other protests in recent years, the republican demonstrations on day one of the Queen's historic visit to the Irish Republic were lacklustre.
Some will argue that it is nevertheless better to have one magnificent teacher working with 40 children than a lacklustre one working with 20.
Komorowski's lacklustre campaign has seen his support erode, and while Duda performed more strongly than some suspected, his support has also dropped in recent weeks.
The Tories got a strikingly good press last week, not least because of the contrast with what was generally perceived to be a lacklustre performance by Labour leader Ed Miliband the previous week.
The recent upsurge in violence has led to anger at the government's lacklustre response to the threat, prompting it to seek assistance from the US, UK and Israel, who are expected to help find the abducted schoolgirls and provide counter-terrorism training programmes.
Despite Labour's domination, Ukip managed to win 23% of all the votes cast across the constituency and was second only to Labour's lacklustre 37%.
In a generally lacklustre election season, Die Linke has managed to stir passions with its demands for a minimum wage and, above all, with its call for immediate withdrawal from Afghanistan – a war that is deeply unpopular.
One of the big disappointments of the evening was how lacklustre the female acting awards were.
Mark Pack is editor of Liberal Democrat Newswire There was something a little lacklustre about Nick's speech, the empty chairs (in contrast with Vince Cable's speech or the economy debate) didn't help and although there was the occasional rapturous applause, the odd whoop, the speech didn't really set the conference hall alight.
They lifted in the second half after a lacklustre effort in the first in which they mustered just one goal.
