- Undecylic Adj
- Undefeated Adj
- Undefendable Adj
- Undefended Adj
- Undefiled Adj
- Undefinable Adj
- Undefined Adj
- Undeflected Adj
- Undeflecting Adj
- Undeformed Adj
- Undelayable Adj
- Undelayed Adj
- Undelegated Adj
- Undeliverable Adj
- Undelivered Adj
- Undemanding Adj
- Undemocratic Adj
- Undemocratical Adj
- Undemonstrable Adj
- Undemonstrative Adj
- Undeniable Adj
- Undenied Adj
- Undenominational Adj
- Undenounced Adj
- Undented Adj
- Undependable Adj
- Undepreciated Adj
- Undepressed Adj
- Under-the-table Adj Adv
- Underachieving Adj
- Underactive Adj
- Underage Adj Noun
- Underaging Noun Adj
- Underappreciated Adj
- Underarm Adj Noun
- Underarmed Adj
- Underassessed Adj
- Underbaked Adj
- Underbalanced Adj
- Underbooked Adj
- Underbred Adj
- Underbudgeted Adj
- Underburned Adj
- Underbust Noun Adj
- Undercapitalised Adj
- Undercapitalized Adj
- Undercharged Adj
- Underclad Adj Verb
- Underclothed Adj
- Undercoated Adj
- Undercompensated Adj
- Undercooked Adj
- Undercooled Adj
- Undercoupled Adj
- Undercover Adj
- Undercritical Adj
- Underdamped Adj
- Underdense Adj
- Underdesigned Adj
- Underdetermined Adj