When I have the time I like to get into the nuance of more common expressions. I've come across a few different ways for stating a need and am wondering which is more prevalent. With literal translation "a/de dhíth" seems to come from a negative/lacking attitude, while "teastaigh" seems to be more passive.

Teastaíonn... uaim. ... is needed by me.

Tá ... a dhíth orm. I have a lack of ...
Tá ... de dhíth orm.

Anybody have any other examples and any illumination for me? Thanks!

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I'm a beginner, so corrections and suggestions are much appreciated!
"What? First we give a month to black history, now we're blowing seven days on the Irish!"
Pierce, upon hearing about Green Week

For I need.. you don't have to say teastaíonn, you can say:

Tá (rud) uaim.

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Please wait for corrections/ more input from other forum members before acting on advice

Irish is less finicky about distinguishing between "need" and "want". English "want" originally meant "lack".

For "necessity", you can use gá:

Má tá gá leis "If it is necessary"
Más gá é "If need be"
Tá gá lena dhéanamh "I needs to be done."
Ní gá dhuit é a dhéanamh. "You don't need to do it."
Ní gá an oiread sin. "(We/You) don't need that many/much."

Or tá sé orm or caithfidh:

Tá orm é a dhéanamh. "I must/need to do it."

Caithfidh mé a dhéanamh. "I have to/need to do it."

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WARNING: Intermediate speaker - await further opinions, corrections and adjustments before acting on my advice.
My "specialty" is Connemara Irish, particularly Cois Fhairrge dialect.
Is fearr Gaeilge ḃriste ná Béarla cliste, cinnte, aċ i ḃfad níos fearr aríst í Gaeilge ḃinn ḃeo na nGaeltaċtaí.
Gaeilge Chonnacht (GC), go háraid Gaeilge Chois Fhairrge (GCF), agus Gaeilge an Chaighdeáin Oifigiúil (CO).