[avaldez_]

Not the commenter you're answering to, but... what's wrong with the words you did just use?

[StevenWaterman]

Non-trans is quite "othering". It implies that being trans is the default

In the same way that we say queer instead of "non-straight"

[hungie]

Nothing. They are just long and have the same meaning. The Latin opposite of "trans-" prefix is "cis-". See the use in terms like cislunar vs translunar.