The voter, Roxy McCrae, admitted that she has previously voted for the Labour Party but was not impressed with the leader’s Sky News performance on Monday evening.
Speaking to Sky News, the voter from Glasgow said Mr Corbyn did not clarify his stance over Brexit enough to convince her to vote for him.
She said: “Having previously voted for Labour I expected Jeremy Corbyn to convince me last night that his party was the way to vote this time around.
“He didn’t do that.
The former Labour supporter said Jeremy Corbyn had not convinced her to vote for him
“He didn’t explain how he plans to fund his policies. He didn’t explain how he plans to deal with immigration or Brexit.
“For me, Theresa May came across far more credible and answered more questions that Jeremy Corbyn.”
Speaking following the TV debate, Mrs May insisted that it was clear Mr Corbyn would not be able to negotiate with the EU.
She said: “Last night showed that Jeremy Corbyn’s minders can put him in a smart blue suit for an interview with Jeremy Paxman but, with his position on Brexit, he will find himself alone and naked in the negotiating chamber of the European Union.
He didn’t explain how he plans to deal with immigration or Brexit
“Now, I know that’s an image that doesn’t bear thinking about, but actually this is very serious.
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“Everything depends on getting Brexit right. So the central question for this election is who has the will and plan to make a success of Brexit so we can build the prosperous Britain.
“I believe there is only one choice. I am clear about the instructions I have been given. While Jeremy Corbyn doesn't have the belief, will and plan – and doesn't have the strength to do so either.”
During an interview with Jeremy Paxman, the Prime Minister reiterated that she would be a “difficult woman” to seal the best possible deal with the European Union, but was not scared to walk away.
She said: “I'm not prepared to sign up to a bad deal to the UK. We're in there to get the best deal for the United Kingdom.
Snap election 2017: The pictures politicians may not want you to see Sat, May 27, 2017
Protests, fights and daleks, it's all happening as the politicians hit the campaign trail for the snap election
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Jeremy Corbyn during a visit to Hackney Marshes Football Pitches, to highlight Labour's manifesto commitment to ensure 5% of the Premier League's television rights income is diverted to the grassroots game, during a General Election campaign
“I’m optimistic because I think the European Union will want to continue their relationship with us. We'll be negotiating hard.”
Following the live TV performance, Mr Corbyn was left embarrassed on Monday after a car-crash interview on Radio Four’s Woman's Hour.
Mr Corbyn failed to outline how much his childcare policy would cost and was filmed attempting to reach for his iPad as he struggled to reveal the figures.
The Labour leader later apologised for his blunder to party activists and has pledged to provide 30 hours of free childcare for all children aged two to four as one of his key policies.