Wow. There is no ancient unified concept of ugliness. Ugly is a rather modern concept, and each of the cultures have a different word within the Proto Indo European family. I checked Latin, Hindi, Norwegian, German, and Chinese and everything was different.
I could probably list several words to build a phrase which denotes the concept of ugliness, based on fear, repulsiveness, danger, or causing one to flee. In a sense, create ugliness for the ancient language.
Pick one of the three noun words for 'appearance' and then we can probably describe what the appearance does to people (verb) and/or an adjective or adverb to describe it. Does i cause fear, is it because of love or hate, or too much or little of something. Is it something unfavorable
Basis of a phrase.
Negating adverb, adjective
ne , not, no, none. It's the basis of no, nay, not, never, nill, null, naughty, neither, neglect, nothing, etc..
Possible adjectives/adverb
dus- , bad, evil, mis-, dys-
hwap- , bad, evil
mel- ,false, bad, wrong. It's the basis of malicious, malevolent, malady, malaria, dismal, and blame
pau- , few, little. It is the basis of few, pony, and poverty.
Suffix to adjective
-os , of, place
Possible verbs
bhegw- to run, flee. It's the basis of phobia.
dhe-k‑ to put, set. It's the basis of face, fashion, modify, edify, beatific, benefit perfect, faction, effect, affect, defect
deu- , to lack, be wanting.
gwhen-do- , strike, kill. It's the basis of offense, defense, offensive, fend, fence
gwere- to favor. It's the basis of grace, gratitude, agree, and grateful.
od- to hate. It is the basis of annoy & odious.
per- to fear, to risk, to try. It is the basis of fear, peril, experience, and pirate.
paw-e- to fear (to be struck)
pleuk- to flee, run in terror, flow. It is the basis of flee, flight, fly.
pri- to love. It is the basis of friend, free, afraid, and -phile.
perseg- to forsake, reject. It is the basis of forsake.
terkw- to turn.
yake- to throw, impel. It is the basis of reject, eject, deject, object,
Suffix to verb
simple, don't add anything.
present tense -ai
add -e-ye , verb form 'to cause __'
Possible prepositions
upo - under, below, from below
uper - above, over
ner - under , below
hen - in
epi - at, near
kam - with
do - to
de- from, out of
per - toward, forward, through, against, around
A possible nouns for appearance
(1)-okw-ti, is visible appearance that you see. It's the basis of optics, autopsy, and synopsis
(2)-kwrep, is body, form, shape, appearance. It's the basis of corpse, corporal, corset, corporate.
(3)-bhe-n-yo, brought to light, appearance, emergence. It's the basis of -phane, fantasy, phantasm, phase, emphasis.
-pos - on, put, place. It's the basis of position, post, post- , compose, impose, oppose, positive, transpose
Suffix of noun
-es , plural
Any of those words inspire a sense of 'Ugly' for a city. I can look up more.