has been faltering
-ha estado titubeando
Present perfect progressive he/she conjugation of falter.

falter

Popularity
500+ learners.
GPS has been faltering due to the wobble.
El GPS ha estado fallando, debido a la oscilación de la Tierra.
Laura seemed like a good candidate, but the quality of her work has been faltering.
Laura pareció ser buena candidata, pero la calidad de su trabajo ha sido vacilante.
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