If a word conforms to a special rule, I call it a Lonely Word™.
Use the following examples below to find the rule.
And, if you want to analyze, here is a CSV version:
LONELY WORD™, NOT LONELY WORD™ CIVIL, FRIENDLY OVAL*, RECTANGULAR DULL, HANDSOME FOCAL, SIGNIFICANT SHINY, POLISHED BIG, MINIATURE CLOWN, ACROBATIC WHOLE*, BROKEN ULOTRICHOUS, DELICIOUS JUSSIEUAN, COURAGEOUS VACUOUS, HAZEL-EYED MINI, TINY** POROUS, ENORMOUS** DOWDY, WEE* *Disputable **Crowded
1. Lonely does not mean Alone.
2. I mentioned in comments that fixing the mistake in Ulotricious would not change the fact that is a Lonely Word™. However, it does bring it one step closer to being a Not Lonely Word™.