unfamiliarity

"Their familiarity was evident in the way they teased each other like siblings. "

"His recent lack of focus in class showed a worrying moral failing. "

"The compost pile attracted many small, white made. "

"The school principal, a respected figure, announced that his decision was final. "

"Do you want to come with?"

"The new school management software allows teachers to easily track student progress. "

"It looks weaker and weaker, the more I think about it."

"The complete survey was handed in to the teacher. "

"I failed to get the job due to inexperience."

"His ignorance of basic math concepts made it difficult for him to understand the lesson. "

"The complicated instructions on the new software difficult me from completing the project on time. "

"My daily task at work is to answer emails. "