Economical with the truth
Definition 1 of 1
Pro Tip 1/3Hidden Truths
Implies someone is intentionally not revealing the whole truth to deceive or mislead. 
In his testimony, he was economical with the truth, avoiding key details.
Pro Tip 2/3Usage Nuance
Often used to criticize subtle dishonesty without accusing someone of outright lying. 
The report was economical with the truth, presenting the data favorably.
Pro Tip 3/3Mild Euphemism
A soft way to suggest that someone is not being completely forthcoming. 
The agent was economical with the truth about the house's history.