She was reckless.
She lived with no limitations.
She lived to no extent.
She lived not giving a damn in the world.
She was carefree.
She was always outside living life to its fullest.
He was timid.
He was the sensitive book-ish type.
He always had precautions.
He was characterized as introvert.
He was scared.
They were opposites.
They were way out of their league.
They were different .
Different in how they act.
Different on how they perceive.
They were different for each other.
"For every difference there is a similarity."