Wiktionary
vb. (context simile English) Be very noticeably different, especially in a negative way; to be particularly obtrusive, conspicuous, blatant, or prominent; to attract undue attention or notice.
Usage examples of "stick out like a sore thumb".
Now two things stick out like a sore thumb: the first is that you don't like your brother.
Now two things stick out like a sore thumb: the first is that you don’.
I stick out like a sore thumb if I go to her at Settlertown, and Tonya is a public figure.
To date he has always been at the venue of our choosing and James could stick out like a sore thumb in Boston, even though he is the best actor of the four of us.
Aside from him hailing from an enemy nation, why would an Indian on the dodge hide out in a white bunkhouse and stick out like a sore thumb if he had even one family of Indians he could blend in with as, say, a real uncle who'd been further west for a spell?