Unsuited

I'm utterly unsuited to express my feelings.

He's totally unsuited for the job.

[…] we are convinced, from considerable experience and observation, that the class of diseases described by Sir James as unsuited to the climate of Pau, et vice versâ […]

It might have been a good thing if he had, unsuited as he was physically, but the mood passed easily under fraternal dissuadings and a feeling of duty toward his father.

Reggie was a “release” from Guiding Eyes; he kept leading his trainers into light poles, so he was deemed temperamentally unsuited to be a service dog.

an unsuited astronaut

You have been dealt King-9 unsuited ("canine") in your pocket.