- Underdressing Noun Pres. Participle
- Underdrilling Noun Adj
- Underdrive Noun Verb Adj
- Underdriven Past Participle
- Underdumped Adj
- Undereducated Adj Past Participle
- Underemphasise Verb
- Underemphasised Adj
- Underemphasize Verb Past Participle
- Underemphasized Adj
- Underemploy Verb
- Underemployed Adj Noun Past Participle
- Underemployment Noun Adj
- Underenumeration Noun Adj
- Underestimate Verb Noun
- Underestimated Adj
- Underestimation Noun
- Underetch Verb Noun Adj
- Underetching Noun Adj
- Underexcitation Noun Adj
- Underexcited Adj Past Participle
- Underexpand Verb
- Underexpanded Adj
- Underexpansion Noun Adj
- Underexpenditure Noun Adj
- Underexploited Adj
- Underexplored Past Participle Verb
- Underexporting Noun Pres. Participle
- Underexpose Verb
- Underexposed Adj
- Underexposing Noun
- Underexposure Noun Adj
- Underfed Adj
- Underfeed Verb Adj
- Underfeeding Noun Adj
- Underfelt Noun Adj
- Underfifiring Adj
- Underfill Noun Verb Adj
- Underfilled Adj Past Participle
- Underfilling Noun Adj
- Underfinanced Adj Past Participle
- Underfinancing Noun Pres. Participle
- Underfired Adj
- Underfiring Noun Pres. Participle
- Underfishing Noun Pres. Participle
- Underfit Verb Adj
- Underfitting Noun Pres. Participle
- Underflooding Noun Pres. Participle Adj
- Underfloor Noun Adj
- Underflow Noun Verb Adj
- Underflowing Adj
- Underflying Pres. Participle Noun
- Underfocusing Noun Pres. Participle
- Underfoot Adv Adj
- Underframe Noun Adj
- Underfrequency Noun Adj
- Underfulfillment Noun
- Underfull Adj
- Underfund Verb
- Underfunded Past Participle