Unfamiliar means not known or recognized, strange or new to you. When something is unfamiliar, you haven't experienced it before or don't know much about it yet.

Walking into a new school on the first day, everything feels unfamiliar: the hallways, the classrooms, the faces around you. An unfamiliar word in a book is one you haven't learned yet. When you travel to a different country, the language, food, and customs might all be unfamiliar.

The feeling of unfamiliarity can be uncomfortable at first. Your brain works harder when processing unfamiliar information because it hasn't built shortcuts yet. But unfamiliar situations also bring opportunities: every expert was once unfamiliar with their field, and every friendship begins with an unfamiliar face.

The opposite of unfamiliar is familiar, which describes things you know well. That favorite book you've read five times? Very familiar. The new student who just transferred from another state? Unfamiliar, at least for now. With time and experience, the unfamiliar becomes familiar, which is simply another way of saying you're learning and growing.