Heather Mills' evidence in her divorce case with Sir Paul McCartney was "inconsistent, inaccurate" and "less than candid", according to the judge.
Mr Justice Bennett's High Court ruling has been revealed in full after Ms Mills was told she could not appeal against its publication.
Ms Mills told the BBC she thought the judgement was "outrageous".
The full ruling was published a day after she was awarded £24.3m at the High Court in London.
The judge determined the final figure after the couple failed to reach an agreement in court last month.
The former model had asked for the full text to be kept private - but two Court of Appeal judges rejected her argument that her daughter's security could be put at risk.
Ms Mills was not present in court.
In the full report, Mr Justice Bennett described Ms Mills as having "a strong-willed and determined personality", and said she was also a "kindly person and devoted to her charitable causes".
BREAKDOWN OF SIR PAUL'S £15.8M OFFER
Costs, not exceeding £150,000 per year, for security would be met for two years
Annual, index-linked payments of £35,000 for Beatrice until she is 17 or ends secondary education
Nanny would be employed for no more than £25,000
He would discharge costs for school fees, uniforms and reasonable extras
Lump sum for the return of some art
"She has conducted her own case before me with a steely, yet courteous, determination," he said.
Sir Paul's evidence was described as "balanced".
"He expressed himself moderately though at times with justifiable irritation, if not anger. He was consistent, accurate and honest," Mr Justice Bennett said.
The judge wrote that he gave Ms Mills "every allowance for the enormous strain she must have been under".
But he added: "I am driven to the conclusion that much of her evidence, both written and oral, was not just inconsistent and inaccurate but also less than candid".
"Overall she was a less than impressive witness," he said.
BREAKDOWN OF MILLS' £125M CLAIM
£3.2m per year for herself and Beatrice
Properties in Los Angeles and New York
Between £8m and £12.5m for a home in London
£3m to purchase a New York home
£500,000 to £750,000 to buy a London office
Monetary value on compensation for loss of earnings
Ms Mills said the decision to publish the address of her houses had affected the security of her and her daughter, Beatrice.
The ruling questioned Ms Mills' statement that she owned a penthouse flat in Piccadilly worth "approximately £500,000" when she met Sir Paul, along with a Brighton property "worth £250,000".
"I have to say I cannot accept the wife's case that she was wealthy and independent by the time she met the husband in the middle of 1999," said Mr Justice Bennett.
He said the penthouse flat "was not worth £500,000 in 1999", adding she sold it in 2001 for £385,000 after the London property market had risen substantially since 1999.
"She did not in 1999 own the property in Brighton. That was not bought until March 2000," he said.
Sir Paul McCartney likened his divorce to "hell" last year
He also questioned her claim that she had £2m-£3m in the bank at this time, adding: "There is no documentary evidence to support that assertion."
And her claim to have had "very significant earnings as set out in her affidavit" were not supported by her tax returns, the ruling said.
The judge added that her tax returns "disclose no charitable giving at all", despite Mills saying she gave "as much as 80% or 90% of her earnings ... direct to charities".
Commenting on that claims, Ms Mills said it was because her accountant "hadn't ticked the tax return box".
The judge found the total value of Sir Paul's assets was about £400m. Ms Mills had sought £125m and been offered £15.8m.
Sir Paul, 65, and Ms Mills, 40, got married in 2002, but they split four years later, blaming media intrusion into their private lives.