not to mention

[not to mention] or [not to speak of] or [to say nothing of]Without ever needing to speak of; in addition to; besides. - Used toadd something to what you have said or explained.

Dave is handsomeand smart not to mention being a good athlete.

They have threefine sons, not to speak of their two lovely daughters.

Sally takessinging and dancing lessons to say nothing of swimming and tennislessons.

Compare: LET ALONE, TO SPEAK OF.