unperplexed
/(ˌ)ʌnpəˈplɛkst/adjective
1Not confused, baffled, or bewildered. Formerly also: †not troubled or distressed (obsolete ).
2Not complicated, confused, or involved; not complex or difficult.
Origin
Mid 16th century; earliest use found in Thomas Phaer (?1510–1560), translator and physician. From un- + perplexed.