Necesitamos unanimidad.

Necesitamos is the 1st person plural form of necesitar, so it means we need.

• necesito = I need
• necesitas = you need
• necesita = he/she/it needs
• necesitamos = we need
• necesitáis = you all need (Spain)
• necesitan = they/you all need

So Necesitamos unanimidad means we need unanimity.

It can also be the preterite form, meaning we needed. For regular -ar verbs, the nosotros form is the same in the present and the preterite:

• necesitamos = we need
• necesitamos = we needed

Usually, context tells you which one is meant. On its own, Necesitamos unanimidad will normally be understood as we need unanimity.

Spanish often drops subject pronouns when they are not needed, because the verb ending already shows who is doing the action.

• Necesitamos unanimidad = We need unanimity
• Nosotros necesitamos unanimidad = also correct, but more emphatic

You might include nosotros if you want contrast or emphasis, for example:

• Nosotros necesitamos unanimidad, ellos no.
  We need unanimity, they don’t.

Because after necesitar, Spanish often uses a noun without an article when speaking in a general sense.

So:

• Necesitamos unanimidad. = We need unanimity.
• Necesitamos ayuda. = We need help.
• Necesito paciencia. = I need patience.

If you say la unanimidad, it usually sounds more specific, as if you mean a particular unanimity already mentioned or understood from context.

Yes, unanimidad is a feminine noun.

A very useful pattern is that many nouns ending in -dad are feminine:

• la ciudad = the city
• la verdad = the truth
• la posibilidad = the possibility
• la unanimidad = unanimity

So if you needed the article, it would be la unanimidad.

A helpful approximate pronunciation is:

neh-seh-see-TAH-mos oo-nah-nee-mee-DAD

A few points:

• Necesitamos is stressed on ta: ne-ce-si-TA-mos
• unanimidad is stressed on the last syllable: u-na-ni-mi-DAD
• The d at the end of unanimidad is softer than in English

In standard Spain Spanish, the c in necesitamos is pronounced like the th in thin, so it sounds roughly like:

neh-theh-see-TAH-mos

But in Latin America, it is usually pronounced like s.

Yes, it is a normal formal word, especially in contexts like:

• meetings
• votes
• committees
• legal or political discussion
• decision-making

For example, if a decision must be approved by everyone, someone might say:

• Necesitamos unanimidad para aprobarlo.
  We need unanimity to approve it.

In everyday casual conversation, people might also express the idea less formally, for example:

• Tenemos que estar todos de acuerdo.
  We all have to agree.

Yes. Hace falta unanimidad is another natural way to express the idea unanimity is needed or we need unanimity.

Compare:

• Necesitamos unanimidad. = We need unanimity.
• Hace falta unanimidad. = Unanimity is needed.

The first is more direct because it includes we.
The second is a bit more impersonal.

It is an abstract noun. It names an idea or quality rather than a physical object.

Other abstract nouns include:

• libertad = freedom
• igualdad = equality
• felicidad = happiness

In Necesitamos unanimidad, unanimidad is the direct object of necesitamos: it is the thing that is needed.

Yes. Necesitar can take a direct object directly, just like to need in English.

Examples:

• Necesito agua. = I need water.
• Necesitamos tiempo. = We need time.
• Necesitan permiso. = They need permission.
• Necesitamos unanimidad. = We need unanimity.

So the structure is very straightforward:

necesitar + noun

It sounds fairly neutral to formal, mainly because of the noun unanimidad. The grammar itself is completely normal and neutral, but the vocabulary is often used in more serious or organized contexts.

So it would sound natural in things like:

• meetings
• official discussions
• negotiations
• voting procedures

In very casual speech, people might choose a more everyday wording depending on the situation.