unstable

"The farmer unstable the horse from the stable before taking it to the field. "

"The old wooden chair was unstable, so I was afraid to sit on it. "

"The weather forecast predicted unstable temperatures, changing from sunny to rainy throughout the day. "

"Her mood was unstable; one minute she was happy, the next she was angry. "

"The weather forecast was unstable, making it hard to plan our outdoor picnic. "

"The old chemistry experiment produced an unstable compound that quickly broke down. "

"The radioactive isotope used in the medical scan was chosen because it's unstable and quickly decays, minimizing the patient's exposure. "