From Longman Dictionary of Contemporary Englishnothing could be further from the truthnothing could be further from the truthUNTRUEused when you want to say that something is completely untrue People often described him as a bitter academic, but nothing could be further from the truth. → further
Examples from the Corpus
nothing could be further from the truth• A lot of people think soufflés are hard to make. Nothing could be further from the truth.• They say he is a spy, but nothing could be further from the truth.nothing could be further from the truthnothing could be further from the truthUNTRUEused to say that something is definitely not true → truth 