unconvertible

adjective

1. capable of being converted.
2. having a folding top, as an automobile or pleasure boat.
3. exchangeable for something of equal value: debts payable only in convertible currencies.

noun

4. an automobile or a boat with a folding top.
5. a sofa, couch, or chair whose seating section can be folded out into a bed.
6. Finance. a convertible bond or security.

adjective

1. capable of being converted
2. (of a car) having a folding or removable roof
3. finance
   1. a bond or debenture that can be converted to ordinary or preference shares on a fixed date at a fixed price
   2. (of a paper currency) exchangeable on demand for precious metal to an equivalent value
   3. Canadian (of a mortgage)able to be converted into a longer term mortgage without financial penalty

noun

4. a car with a folding or removable roof

adj.late 14c., from Old French convertible (13c.), from Late Latin convertibilis “changeable,” from Latin convertere (see convert (v.)). The noun is recorded from 1610s; meaning “automobile with a fold-down top” is from 1916.