| undeceive | (verb) free from deception or illusion | - |
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| underachieve | (verb) perform less well or with less success than expected | Synonyms: underperform |
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| underact | (verb) act (a role) with great restraint | Synonyms: underplay |
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| underbid | (verb) bid too low | - |
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| (verb) bid lower than a competing bidder | - |
| (verb) bid (a hand of cards) at less than the strength of the hand warrants | - |
| undercharge | (verb) charge (someone) too little money | - |
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| undercoat | (verb) cover with a primer; apply a primer to | Synonyms: ground, prime |
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| undercut | (verb) strike (the ball) in golf, tennis, or hockey obliquely downward so as to give a backspin or elevation to the shot | - |
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| (verb) cut away the underpart of | - |
| (verb) cut away material from the underside of (an object) so as to leave an overhanging portion in relief | - |
| (verb) cut obliquely into (a tree) below the main cut and on the side toward which the tree will fall | - |
| (verb) sell cheaper than one's competition | Synonyms: undersell |
| underdevelop | (verb) process (a film or photographic plate) less than the required time or in an ineffective solution or at an insufficiently high temperature | - |
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| underdress | (verb) dress informally and casually | Synonyms: dress down |
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| (verb) dress without sufficient warmth | - |
| underestimate | (verb) make a deliberately low estimate | Synonyms: lowball |
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| (verb) make too low an estimate of | Synonyms: underrate |
| (verb) assign too low a value to | Synonyms: undervalue |
| underexpose | (verb) expose insufficiently | - |
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| (verb) expose to too little light | - |
| undergird | (verb) make secure underneath | Synonyms: brace up |
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| (verb) lend moral support to | - |
| undergo | (verb) go through | - |
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| undergrow | (verb) grow below something | - |
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| underlay | (verb) provide with a base, support, lining, or backing | - |
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| (verb) put (something) under or beneath | - |
| (verb) raise or support (the level of printing) by inserting a piece of paper or cardboard under the type | - |
| underlie | (verb) be or form the base for | - |
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| (verb) lie underneath | - |
| underline | (verb) give extra weight to (a communication) | Synonyms: emphasise, emphasize, underscore |
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| (verb) draw a line or lines underneath to call attention to | Synonyms: underscore |
| undermine | (verb) hollow out as if making a cave or opening | Synonyms: cave |
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| (verb) destroy property or hinder normal operations | Synonyms: counteract, countermine, sabotage, subvert, weaken |
| undernourish | (verb) provide with insufficient quality or quantity of nourishment | Synonyms: malnourish |
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| underpay | (verb) pay too little | - |
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| underperform | (verb) perform too rarely | - |
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| (verb) perform less well or with less success than expected | Synonyms: underachieve |
| underpin | (verb) support from beneath | - |
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| (verb) support with evidence or authority or make more certain or confirm | Synonyms: bear out, corroborate, support |
| underplay | (verb) play a card lower than (a held high card) | - |
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| (verb) act (a role) with great restraint | Synonyms: underact |
| underprice | (verb) sell at artificially low prices | Synonyms: dump |
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| underproduce | (verb) produce below capacity or demand | - |
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| underquote | (verb) quote a price lower than that quoted by (another seller) | - |
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| (verb) offer for sale at a price lower than the market price | - |
| underrate | (verb) make too low an estimate of | Synonyms: underestimate |
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| underrun | (verb) haul onto a boat | - |
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| (verb) run or pass below | - |
| underscore | (verb) give extra weight to (a communication) | Synonyms: emphasise, emphasize, underline |
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| (verb) draw a line or lines underneath to call attention to | Synonyms: underline |
| undersell | (verb) sell cheaper than one's competition | Synonyms: undercut |
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| undershoot | (verb) shoot short of or below (a target) | - |
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| (verb) fall short of (the runway) in a landing | - |
| undersign | (verb) sign at the bottom of (a document) | - |
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| underspend | (verb) spend at less than the normal rate | - |
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| (verb) spend less than the whole of (a budget, for example) | - |
| understand | (verb) know and comprehend the nature or meaning of | - |
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| (verb) perceive (an idea or situation) mentally | Synonyms: realise, realize, see |
| (verb) believe to be the case | Synonyms: infer |
| (verb) make sense of a language | Synonyms: interpret, read, translate |
| (verb) be understanding of | Synonyms: empathise, empathize, sympathise, sympathize |
| understate | (verb) represent as less significant or important | Synonyms: downplay, minimise, minimize |
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| understock | (verb) stock with less than the usual or desirable number or quantity | - |
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| understudy | (verb) be an understudy or alternate for a role | Synonyms: alternate |
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| undertake | (verb) promise to do or accomplish | Synonyms: guarantee |
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| (verb) enter into a contractual arrangement | Synonyms: contract |
| (verb) enter upon an activity or enterprise | Synonyms: attempt, set about |
| (verb) accept as a charge | Synonyms: take in charge |
| (verb) accept as a challenge | Synonyms: tackle, take on |
| undervalue | (verb) lose in value | Synonyms: depreciate, devaluate, devalue |
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| (verb) assign too low a value to | Synonyms: underestimate |
| (verb) esteem lightly | - |
| underwrite | (verb) protect by insurance | Synonyms: cover, insure |
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| (verb) guarantee financial support of | Synonyms: subvent, subvention |
| undo | (verb) cancel, annul, or reverse an action or its effect | - |
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| (verb) cause to become loose | Synonyms: loosen, untie |
| (verb) remove the outer cover or wrapping of | Synonyms: unwrap |
| (verb) deprive of certain characteristics | Synonyms: unmake |
| (verb) cause the ruin or downfall of | - |
| undock | (verb) take (a ship) out of a dock | - |
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| (verb) move out of a dock | - |
| undrape | (verb) strip something of drapery | - |
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| undress | (verb) get undressed | Synonyms: discase, disrobe, peel, strip, strip down, uncase, unclothe |
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| (verb) remove (someone's or one's own) clothes | Synonyms: disinvest, divest, strip |
| undulate | (verb) increase and decrease in volume or pitch, as if in waves | - |
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| (verb) move in a wavy pattern or with a rising and falling motion | Synonyms: flap, roll, wave |
| (verb) stir up (water) so as to form ripples | Synonyms: cockle, riffle, ripple, ruffle |
| (verb) occur in soft rounded shapes | Synonyms: roll |