The phrase "valid reason" means having a good and logical explanation or justification for something. It implies that the reason given is reasonable and acceptable. Full definition
These concerns are valid and need to be addressed, but they are not valid reasons for delaying your decision to take advantage of the business process improvements technology has to offer. (remonline.com)
It's absolutely a great way to feed a baby, and there are a number of very valid reasons why moms might choose it. (romper.com)
Having an expansive backyard or the whole apartment for a small dog to roam aren't valid reasons not to walk your canine. (petsmagazine.com.sg)