- Under-resourced Adj
- Under-screen Adj
- Under-tempered Past Participle
- Under-the-table Adj Adv
- Under-tighten Verb
- Under-tightening Noun Pres. Participle
- Underachieve Verb
- Underachievement Noun Adj
- Underachiever Noun Adj
- Underachieving Adj Noun
- Underact Verb
- Underacting Noun Pres. Participle
- Underactive Adj
- Underactivity Noun
- Underactor Noun
- Underage Adj Noun
- Underaging Noun Adj
- Underappreciated Adj
- Underappreciation Noun
- Underarm Adj Noun Adv
- Underarmed Adj
- Underassessed Adj
- Underbaked Adj
- Underbalance Noun Verb
- Underbalanced Past Participle
- Underbarrel Noun Adj
- Underbedding Noun Pres. Participle
- Underbelly Noun Adj
- Underbid Noun Verb Past Participle
- Underbidder Noun Adj
- Underbidding Noun Pres. Participle
- Underblanket Noun Adj
- Underboarding Noun Adj
- Underbody Noun Adj
- Underbooked Adj
- Underbreaking Noun Pres. Participle
- Underbred Adj Past Participle
- Underbridge Noun Adj
- Underbrush Noun Adj
- Underbudgeted Adj Past Participle
- Underbunching Noun Adj
- Underburn Verb Noun
- Underburned Past Participle
- Underburning Noun Pres. Participle
- Underbust Noun Adj
- Underbuy Verb Past Participle
- Undercapacity Noun Adj
- Undercapitalise Verb
- Undercapitalised Adj
- Undercapitalization Noun Adj
- Undercapitalize Verb Past Participle
- Undercapitalized Adj
- Undercarriage Noun Adj
- Undercast Noun Verb
- Undercharge Noun Verb Past Participle
- Undercharged Adj
- Undercharging Noun Pres. Participle
- Underclad Adj Verb
- Underclass Noun Adj
- Underclassman Noun Adj