'unsecure' => 'insecure'

activemodel/lib/active_model/locale/en.yml

@@ -28,4 +28,4 @@ en:
 
     attributes:
       password:
-        unsecure: "is too weak and common"
+        insecure: "is too weak and common"

activemodel/lib/active_model/secure_password.rb

@@ -64,7 +64,7 @@ module ActiveModel
     def password_must_be_strong
       if password.present?
         errors.add(:password, :too_short, :count => 7) unless password.size > 6
-        errors.add(:password, :unsecure) if WEAK_PASSWORDS.include?(password)
+        errors.add(:password, :insecure) if WEAK_PASSWORDS.include?(password)
       end
     end
   end