Agree with earlier comments that intentionally failing to mention a relevant truth (when one has an opportunity, when the relevant truth has not already been raised by others, etc.) can be an intention to deceive. But if we define "lie by omission" more broadly to include the failure to utter truths, then the only way to avoid it is to know everything, talk constantly, and approach infinite full disclosure by finite steps.
Agree with earlier comments that intentionally failing to mention a relevant truth (when one has an opportunity, when the relevant truth has not already been raised by others, etc.) can be an intention to deceive. But if we define "lie by omission" more broadly to include the failure to utter truths, then the only way to avoid it is to know everything, talk constantly, and approach infinite full disclosure by finite steps.