ambiguous
mysterious
straightforward
inscrutable
Answer: straightforward
Explanation:
arrival
origin
departure
target
Answer: origin
Odious
Austere
Pleasant
Sombre
Answer: Pleasant
lethality
Death
Birth
Fatality
Answer: Birth
Basic
Simple
Acquired
Unassuming
Answer: Acquired
productive
diligent
indolent
Assiduous
Answer: indolent
Execute
Prevent
Perform
Commit
Answer: Prevent
sullen
mournful
cheerful
unsatisfied
Answer: cheerful
confirm
approve
verify
contradict
Answer: contradict
heighten
amplify
compress
overdo
Answer: compress