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Signs for UGLY
Definition: very unattractive or unpleasant to look at; offensive to the sense of beauty; displeasing in appearance; visually unpleasing.
Antonym: PRETTY.
Written ASL
[Note: ASL writing is not an official standard. This sign language writing remains in a state of open space to allow room for experiment, evolution, and improvement.]

Written ASL digit for "VERY-UGLY" contributed by Todd Hicks in the ASLwrite community, 2018.
Deaf Culture and tidbits
Deaf Humor
An funny anecdote from https://www.handspeak.com/learn/203
"A student, in ASL 111 at a university, raised her hand and naively asked (oblivious to this context), BEAUTIFUL OPPOSITE SIGN WHAT? I responded UGLY.
"The classmates chuckled, imagining something. In this context, we were talking about family members in photographs that the students shared with one another, using vocabulary such as BEAUTIFUL, LOOK-ALIKE (resemble), TALL, WHEN, WHERE, OCCASION/EVENT WHAT, CUTE, OLD, LOOK-YOUNG, etc. Now you get the picture." -- Jolanta Lapiak, ASL Instructor. (2015)