Emotion is related to Anger. Anxious is etymologically related to Anger. Anxious is the opposite of Easy. Easy is a different concept from Complicated. 
Pretty is related to Nature. Nature can be Wonderful. Wonderful is a synonym of Remarkable. Remarkable is a synonym of Unusual. 
Emotion <--RelatedTo--> Anger <--EtymologicallyRelatedTo-- Anxious <--Antonym--> Easy <--DistinctFrom--> Complicated 
Pretty <--RelatedTo--> Nature --HasProperty--> Wonderful <--Synonym--> Remarkable <--Synonym--> Unusual 