How to Say "excessive number" in Spanish
The Spanish word for “excessive number” is “demasiadas” — A2 level. This is a very common word in everyday Spanish.

Examples
Hay demasiadas personas en la fila.
There are too many people in the line.
Compraste demasiadas flores; no caben en el jarrón.
You bought too many flowers; they don't fit in the vase.
Ella tiene demasiadas preocupaciones sobre el futuro.
She has too many worries about the future.
Always Agree!
Since 'demasiadas' is describing a noun, it must match that noun exactly. Use 'demasiadas' only when the noun is feminine and plural, like 'manzanas' (apples) or 'sillas' (chairs).
It means 'Too Much'
Unlike 'muchas' (many), 'demasiadas' carries a negative tone. It implies the quantity is excessive or a problem. For example, 'demasiadas reglas' means 'too many rules' (bad thing).
Mixing Genders
Mistake: “Hay demasiados mesas.”
Correction: Hay demasiadas mesas. (Because 'mesas' is feminine, the quantifier must be feminine.)
Using the Adverb Form
Mistake: “Ellas comen demasiado.”
Correction: This is actually correct if you mean 'They eat too much' (adverb, which is invariable). But if you mean 'They eat too many things,' you must say 'Comen demasiadas cosas.'
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