In general contexts, something that ossifies becomes hardened or conventional and opposed to change. In medical contexts, something that ossifies (such as cartilage) forms or is transformed into bone.

// I asked if she'd reconsider her position, but her opinions on the matter have clearly ossified.

A propensity is a strong natural tendency to do something.

// As a child, she had a strong propensity for mischief.

Copious is a synonym of abundant and plentiful. It is always used before a noun to describe something very large in amount or number.

// The pie was served with a copious amount of ice cream.

// Jacqueline took copious notes during the long lecture and shared them with the rest of her study group.

A gadabout is a person who flits about in social activity, as by going to many places and social events for pleasure.

// She was a gadabout who was rarely home, and her tiny apartment was cluttered with playbills and other souvenirs of her adventures.

Sentient is a formal term that typically describes beings conscious of or responsive to the sensations of seeing, hearing, feeling, tasting, or smelling.

// An avid gardener, Dorothy has recently been absorbed in books that examine the question of whether, and to what degree, plants are sentient.