English Irregular Verbs : U

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English Irregular Verbs

There are many Irregular Verbs in English which do not conform to the pattern. The principal parts of the English verb are the base form, the simple past, and the past participle. For regular verbs, the simple past and the past participle are spelled the same and are created by adding ed to the base form. However, there are many irregular verbs in English which do not conform to this pattern.

The additional forms of the verb in English are the s form (3rd person singular present), and the present participle, which is created by adding ing to the base form. There are no irregular forms of the present participle, so the spelling of any verb will adhere to the rules of spelling for regular inflection.

A comprehensive list of 619 English irregular verbs, including their base form, past simple, past participle and definitions is here below.

Base Form	Past Simple	Past Participle	Definition
Unbear	Unbore	Unborn/Unborne	To remove a horse's rein and straps
Unbend	Unbent	Unbent	To retore something to its original shape that has been distorted
Unbind	Unbound	Unbound	To set something free To untie, remove ropes, chains, etc..
Unbuild	Unbuilt	Unbuilt	To demolish
Unclothe	Unclad/Unclothed	Unclad/Unclothed	To remove clothes
Underbid	Underbid	Underbid/Underbidden	To offer less money in an auction or sale
Underbuy	Underbought	Underbought	To buy for less than the real value
Undercut	Undercut	Undercut	To sell at a cheaper price than a competitor
Underdo	Underdid	Underdone	To do less than necessary Not to cook enough
Underfeed	Underfed	Underfed	To give too little food to someone or an animal
Undergird	Undergirt/Undergirded	Undergirt/Undergirded	To make something secure underneath To give moral support
Undergo	Underwent	Undergone	To suffer or go through an unpleasant experience, such as surgery
Underlay	Underlaid	Underlaid	To put underneath something
Underlet	Underlet	Underlet	To rent for less than the real value
Underlie	Underlay	Underlain	To be the real reason, meaning or idea behind something, usually hidden or not clear
Underpay	Underpaid	Underpaid	To pay someone too little or pay less than the price
Underrun	Underran	Underrun	To pass or flow underneath something
Undersell	Undersold	Undersold	To sell at a lower price than a competitor
Undershoot	Undershot	Undershot	To shoot too short Not to reach a traget
Underspend	Underspent	Underspent	To sepnd less money than allocated in the department or company's budget
Understand	Understood	Understood	To know or come to know the meaning of something
Undertake	Undertook	Undertaken	To accept responsibility for doing something
Underthrust	Underthrust	Underthrust	To insert faulted rock under a passive rock mass
Underwrite	Underwrote	Underwritten	To accept part or all of a financial risk, especially insurance
Undo	Undid	Undone	To ruin somebody's reputation To 'open' clothes or shoes before taking them off
Undraw	Undrew	Undrawn	To open a curtain To withdraw
Undraw	Undrew	Undrawn	To open, draw back (curtains, etc)
Unfreeze	Unfroze	Unfrozen	To make assets availably for use To thaw something
Unhang	Unhung	Unhung	To remove something that is hanging
Unhide	Unhid	Unhidden	To expose something that was hidden
Unhold	Unheld	Unheld	To stop holding or not to hold
Unknit	Unknit/Unknitted	Unknit/Unknitted	To untie
Unlade	Unladed	Unladen/Unladed	To remove cargo, unload
Unlay	Unlaid	Unlaid	To untwist a rope
Unlearn	Unlearnt/Unlearned	Unlearnt/Unlearned	To try to forget or change a habit or something that had been learned
Unmake	Unmade	Unmade	To remove a decision
Unreeve	Unrove/Unreeved	Unrove/Unreeved	To remove a rope from a hook
Unsay	Unsaid	Unsaid	Not to say something To take back something that you said
Unsell	Unsold	Unsold	To convince someone that something is worthless or false
Unsew	Unsewed	Unsewn/Unsewed	To undo someone sewed, remove the stitches
Unsling	Unslung	Unslung	To remove something held in a sling
Unspeak	Unspoke	Unspoken	To take back what has been said or not to say something
Unspin	Unspun	Unspun	To untwist or unravel
Unstick	Unstuck	Unstuck	To seperate things that have been stuck together To take off
Unstring	Unstrung	Unstrung	To open something secured with string
Unswear	Unswore	Unsworn	To take back an oath
Unteach	Untaught	Untaught	To make someone forget something they have learned
Unthink	Unthought	Unthought	To remove something from your mind
Untread	Untrod	Untrodden	To tread back, retrace your steps
Unweave	Unwove	Unwoven	To undo things that have been woven together
Unwind	Unwound	Unwound	To relax
Unwrite	Unwrote	Unwritten	To delete writing or not to write
Upbuild	Upbuilt	Upbuilt	To build up, develop on a large scale
Uphold	Upheld	Upheld	To support or confirm a decision
Uppercut	Uppercut	Uppercut	To punch upwards towards someone's chin
Uprise	Uprose	Uprisen	To get up, stand up, move up To return from the dead
Upset	Upset	Upset	To make somebody unhappy or disturbed
Upspring	Upsprang	Upsprung	To jump or spring up
Upsweep	Upswept	Upswept	To sweep or brush upwards
Uptear	Uptore	Uptorn	To tear into pieces

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