1. conduct or actions that deviate from what is considered normal, standard, or expected
The child's atypical behavior concerned the teacher.
O comportamento atípico da criança preocupou a professora.
2. actions that are unusual or not conforming to a established pattern or type
His atypical behavior at the meeting raised several eyebrows.
Seu comportamento atípico na reunião levantou muitas sobrancelhas.