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lleihau

lessen

"lleihau" means "lessen" in Welsh. Full conjugation table with present, imperfect, preterite, future, conditional, and imperative tenses.

Present

Presennol

PersonForm
I (fi)lleihaf
You sg. (ti)lleihei
He/She (fe/hi)lleihâ
We (ni)lleihawn
You pl. (chi)lleihewch
They (nhw)lleihânt
Impersonallleiheir

Imperfect

Amherffaith

PersonForm
I (fi)lleihawn
You sg. (ti)lleihait
He/She (fe/hi)lleihâi
We (ni)lleihaem
You pl. (chi)lleihaech
They (nhw)lleihaent
Impersonallleiheid

Preterite

Gorffennol

PersonForm
I (fi)lleiheais
You sg. (ti)lleiheaist
He/She (fe/hi)lleihaodd
We (ni)lleihasom
You pl. (chi)lleihasoch
They (nhw)lleihasant
Impersonallleihawyd

Pluperfect

Gorberffaith

PersonForm
I (fi)lleihaswn
You sg. (ti)lleihasit
He/She (fe/hi)lleihasai
We (ni)lleihasem
You pl. (chi)lleihasech
They (nhw)lleihasent
Impersonallleihasid

Future

Dyfodol

PersonForm
I (fi)lleihâ i
You sg. (ti)lleihai di
He/She (fe/hi)hi o
We (ni)lleihawn ni
You pl. (chi)lleihewch chi
They (nhw)lleihân nhw

Conditional

Amodol

PersonForm
I (fi)lleihawn
You sg. (ti)lleihait
He/She (fe/hi)hi
We (ni)lleihaem
You pl. (chi)lleihaech
They (nhw)lleihaent
Impersonallleiheid

Imperative

Gorchmynnol

PersonForm
I (fi)-
You sg. (ti)lleihâ
He/She (fe/hi)lleihaed
We (ni)lleihawn
You pl. (chi)lleihewch
They (nhw)lleihaent
Impersonallleihaer

Example sentences

Nid wyf am roi'r holl ganfyddiadau i chi, ond cytunodd 14 allan o 15 fod pwysau costau byw yn debygol iawn o arwain at orfod lleihau nifer y gwasanaethau a ddarperir.

I won't give you all the findings, but 14 out of 15 agreed that cost-of-living pressures are highly likely to result in them having to reduce the volume of services delivered.

B2

Ond pwrpas cyllido meysydd ataliol fel chwaraeon a diwylliant yw lleihau’r pwysau hynny.

However, the purpose of funding preventative areas such as sport and culture is to reduce those pressures.

B2

Daeth BSL ar yr agenda mewn ysgolion, a phob clod i'r Llywodraeth am hynny, ond mae hynny wedi lleihau, ac yn golygu bod angen dod o hyd i ateb mwy parhaol.

BSL came on the agenda in schools, and credit to the Government for that, but that has waned, and that means a more permanent solution needs to be found.

C1

Mae digwyddiadau tywydd eithafol fel storm Darragh fis Rhagfyr diwethaf yn debygol o ddod yn ddigwyddiadau mwy cyffredin, wrth inni fethu'n lân â lleihau ein hallyriadau carbon mor gyflym ag y mae'r arbenigwyr yn ein hannog i'w wneud.

Extreme weather events like storm Darragh last December are likely to become more common, as we are absolutely failing to reduce our carbon emissions as fast as the experts urge us to.

C1

Further reading

Welsh Verb Conjugation — All Tenses, Full Tables, Clear Patterns →The Welsh Verb Bod (To Be) — Every Form, Every Tense →Welsh Pronunciation — It's Actually Easier Than English →Best Apps to Learn Welsh (2026) →Browse all Welsh verb conjugations →

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Other Welsh verbs

euro

to gild

uno

to join

duo

to become black

mela

to gather nectar to make honey

dal

to catch

trio

to try

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