A third of the electorate also believe politicians care less about the issue they are discussing if they resort to prepared speeches, according to the survey of more than 3,000 UK voters.
More than 60 per cent of respondents believe "a lot of politicians seem to talk without actually saying anything meaningful", while 45 per cent said candidates should speak "plain English".
Phrases that repeatedly came up during the leaders’ debate, such as "weaponising the NHS" and "good immigration and bad immigration" were deemed vague and meaningless.
Will Sturgeon, executive director at Golin, said: "With less than three weeks to go until the polls open, the election campaign is really in full swing. But politicians are clearly wasting opportunities to be heard because the language they use is turning off voters and almost certainly reinforcing the notion they are out of touch.
"There’s far too much jargon and far too much waffle and clearly voters are getting fed up with it. Voters want authenticity and a greater sense of honesty, neither of which tend to come across well in a soundbite that has been developed by a committee and used repeatedly. Politicians need to remember when they step into the outside world that their priority should be to make themselves understood."