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rhwystro

to prevent

"rhwystro" means "to prevent" in Welsh. Full conjugation table with present, imperfect, preterite, future, conditional, and imperative tenses.

Present

Presennol

PersonForm
I (fi)rhwystraf
You sg. (ti)rhwystri
He/She (fe/hi)rhwystro
We (ni)rhwystrwn
You pl. (chi)rhwystrwch
They (nhw)rhwystrant
Impersonalrhwystrir

Imperfect

Amherffaith

PersonForm
I (fi)rhwystrwn
You sg. (ti)rhwystrit
He/She (fe/hi)rhwystrai
We (ni)rhwystrem
You pl. (chi)rhwystrech
They (nhw)rhwystrent
Impersonalrhwystrid

Preterite

Gorffennol

PersonForm
I (fi)rhwystrais
You sg. (ti)rhwystraist
He/She (fe/hi)rhwystrodd
We (ni)rhwystrasom
You pl. (chi)rhwystrasoch
They (nhw)rhwystrasant
Impersonalrhwystrwyd

Pluperfect

Gorberffaith

PersonForm
I (fi)rhwystraswn
You sg. (ti)rhwystrasit
He/She (fe/hi)rhwystrasai
We (ni)rhwystrasem
You pl. (chi)rhwystrasech
They (nhw)rhwystrasent
Impersonalrhwystrasid

Future

Dyfodol

PersonForm
I (fi)rhwystra i
You sg. (ti)rhwystri di
He/She (fe/hi)hi o
We (ni)rhwystrwn ni
You pl. (chi)rhwystrwch chi
They (nhw)rhwystran nhw

Conditional

Amodol

PersonForm
I (fi)rhwystrwn
You sg. (ti)rhwystrit
He/She (fe/hi)hi
We (ni)rhwystrem
You pl. (chi)rhwystrech
They (nhw)rhwystrent
Impersonalrhwystrid

Imperative

Gorchmynnol

PersonForm
I (fi)-
You sg. (ti)rhwystra
He/She (fe/hi)rhwystred
We (ni)rhwystrwn
You pl. (chi)rhwystrwch
They (nhw)rhwystrent
Impersonalrhwystrer

Example sentences

Yn dilyn y canfyddiadau hynny, nid yw Llywodraeth Cymru wedi ymrwymo eto i unrhyw fecanweithiau newydd i fynd i'r afael â'r bylchau hyn, ac mae wedi ceisio rhwystro craffu effeithiol ym mhob ffordd.

Off the back of those findings, the Welsh Government has still not committed to any new mechanisms to address these gaps, and it has tried all methods to block effective scrutiny.

C1

Gadewch i mi eich atgoffa chi unwaith eto bod hon yn gyllideb y gwnaethoch chi geisio ei rhwystro.

Let me remind you once again that this was a budget that you tried to block.

B2

Ac os yw eu cymydog yn adeiladu rhywbeth sy'n rhwystro eu hawl i olau, mae angen iddyn nhw ddeall eu hawliau yn y fan yna, ond hefyd mae angen i'r cymydog ddeall ei gyfrifoldebau.

And if their neighbour is building something that's blocking their right to light, they need to understand their rights there, but also the neighbour needs to understand their responsibilities.

B2

Ni ddylai unrhyw blentyn neu berson ifanc gael yr hawl honno wedi'i rhwystro gan ddiffyg mynediad at drafnidiaeth.

No child or young person should find that right blocked by a lack of access to transport.

B2

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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