- Under-tighten Verb
- Underachieve Verb
- Underact Verb
- Underbalance Noun Verb
- Underbid Noun Verb Past Participle
- Underburn Verb Noun
- Underbuy Verb Past Participle
- Undercapitalise Verb
- Undercapitalize Verb Past Participle
- Undercast Noun Verb
- Undercharge Noun Verb Past Participle
- Underclad Adj Verb
- Undercoat Noun Verb Adj
- Undercook Verb Noun
- Undercool Verb
- Undercount Noun Verb
- Undercut Noun Verb Past Participle
- Underdefine Verb
- Underdeliver Verb
- Underdevelop Verb
- Underdo Verb
- Underdose Noun Verb
- Underdrain Noun Verb Adj
- Underdress Noun Verb
- Underdrive Noun Verb Adj
- Underemphasise Verb
- Underemphasize Verb Past Participle
- Underemploy Verb
- Underestimate Verb Noun
- Underetch Verb Noun Adj
- Underexpand Verb
- Underexplored Past Participle Verb
- Underexpose Verb
- Underfeed Verb Adj
- Underfill Noun Verb Adj
- Underfit Verb Adj
- Underflow Noun Verb Adj
- Underfund Verb
- Undergird Verb
- Underglaze Noun Verb Adj
- Undergo Verb
- Underkeep Verb
- Underlap Noun Verb Adj
- Underlay Noun Verb Adj
- Underlease Noun Verb Adj
- Underlet Verb Noun Past Participle
- Underlie Verb
- Underline Noun Verb Adj
- Underload Noun Verb Adj
- Undermine Verb
- Undernourish Verb Past Participle Pres. Participle
- Underpaid Adj Verb
- Underpass Noun Verb Adj
- Underpay Verb
- Underperform Verb
- Underpin Verb
- Underplay Verb Noun
- Underplayed Adj Verb
- Underplot Noun Verb
- Underpower Verb Past Participle