How to Say "motionless" in Spanish
The Spanish word for “motionless” is “quieto” — A1 level. This is a very common word in everyday Spanish.

Examples
El perro se quedó quieto en la esquina esperando su premio.
The dog stayed still in the corner waiting for its treat.
Si te quedas quieto, la ardilla no te verá.
If you stay motionless, the squirrel won't see you.
La foto es borrosa porque no estuviste quieta.
The photo is blurry because you weren't still (feminine form).
Agreement is Key
Since 'quieto' is an adjective, its ending must match the gender and number of the person or thing it describes: quieto (m. sing.), quieta (f. sing.), quietos (m. plural), quietas (f. plural).
Using Ser vs. Estar
Use 'estar' (like in 'estar quieto') to describe a temporary state of not moving. Use 'ser' only if you are describing someone who is naturally a very calm or inactive person, but this is less common.
Forgetting Gender Match
Mistake: “La niña es quieto.”
Correction: La niña es quieta. (The adjective must end in 'a' to match 'niña'.)
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