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deall

to understand

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

Present

Presennol

PersonForm
I (fi)deallaf
You sg. (ti)deelli
He/She (fe/hi)deall
We (ni)deallwn
You pl. (chi)deellwch
They (nhw)deallant
Impersonaldeellir

Imperfect

Amherffaith

PersonForm
I (fi)deallwn
You sg. (ti)deallit
He/She (fe/hi)deallai
We (ni)deallem
You pl. (chi)deallech
They (nhw)deallent
Impersonaldeellid

Preterite

Gorffennol

PersonForm
I (fi)deellais
You sg. (ti)deellaist
He/She (fe/hi)deallodd
We (ni)deallasom
You pl. (chi)deallasoch
They (nhw)deallasant
Impersonaldeallwyd

Pluperfect

Gorberffaith

PersonForm
I (fi)deallaswn
You sg. (ti)deallasit
He/She (fe/hi)deallasai
We (ni)deallasem
You pl. (chi)deallasech
They (nhw)deallasent
Impersonaldeallasid

Future

Dyfodol

PersonForm
I (fi)dealla i
You sg. (ti)dealli di
He/She (fe/hi)deallith o
We (ni)deallwn ni
You pl. (chi)deallwch chi
They (nhw)deallan nhw

Conditional

Amodol

PersonForm
I (fi)deallwn
You sg. (ti)deallit
He/She (fe/hi)hi
We (ni)deallem
You pl. (chi)deallech
They (nhw)deallent
Impersonaldeellid

Imperative

Gorchmynnol

PersonForm
I (fi)-
You sg. (ti)deall
He/She (fe/hi)dealled
We (ni)deallwn
You pl. (chi)deellwch
They (nhw)deallent
Impersonaldealler

Example sentences

Dw i'n gallu deall dy iaith di.

I can understand your language.

A1

Dydy Tom ddim yn deall Ffrangeg.

Tom doesn't understand French.

C1

Ydy'r ddau ohonynt yn deall Siapaneg?

Do they both understand Japanese?

B2

Dw i ddim yn deall.

I don't understand.

A2

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

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dal

to catch

trio

to try

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