unpaintable
/ʌnˈpeɪntəbəl/
adjective
- Not able to be painted; unsuitable for painting.
- The plastic surface was so smooth and oily that it was essentially unpaintable.
- Some modern wall coverings are designed to be unpaintable, so you have to replace them instead.
- The artist declared the old canvas unpaintable because the fabric had rotted away.
Antonyms