Try this
Dear ________,
Thank you very much for your application for the position of __________.
We received a number of very strong applications for the post and have taken some time to review each application against the criteria outlined in the job description.
It is therefore with regret I write to inform you that after careful consideration we will not be progressing your application on this occasion.
I would like to thank you for your interest in working for ________ and wish you every success in your job search.
Yours sincerely,
__________