sexy
She said his beard was the unsexiest thing imaginable.
Wearing warm socks in bed might be unsexy but if it stops cold feet from keeping you awake, who cares?

unsexyadjective (EXCITEMENT)

not interesting or exciting: 烦人的;乏味的;无聊的
Sanitation is unsexy - it's not glamorous, and people don't want to talk about it.
They are the richest, stupidest, and unsexiest family in the city.
Opposite