How to translate "很不起眼儿" in English
my preference: "很不起眼儿" can be translated into “unimpressive”,while "其貌不扬" into "unimpressive-looking". The reason is that "unimpressive" can refer to many aspects such as his appearance, his achievement, and etc. Compared with"很不起眼儿", ""其貌不扬"is more specific to the appearance, so "looking" is added to "unimpressive".