unfamiliar

The difficulty was scale: thousands of phosphine ligands exist, and experimentally screening them for an unfamiliar reaction would be slow, labor-intensive, and generate unnecessary chemical waste.

This term, which was unfamiliar to many, referred to districts where no racial or ethnic group had a majority.

Together we’d read books, practice unfamiliar words and work through math problems to help her catch up to grade level.

Researchers at the University of Cincinnati discovered that monk parakeets meeting unfamiliar birds tend to "test the waters" before deciding whether a potential partner is safe to approach.

While a viewer unfamiliar with this story that defies the laws of physics might find it less than absolutely clear, a remarkable amount of information still comes through.