Here are examples of the word/phrase "unconventional" used in a sentence and paraphrased in a sentence...
Variables written in all caps? That is very unconventional.
Variables written in all caps? That is very unwonted.
It is unconventional to live in an igloo unless you're an eskimo.
It is uncommon to live in an igloo unless you're an eskimo.
Starting the game without singing the national anthem first is unconventional.
Starting the game without singing the national anthem first is uncommon.
Other Examples...