realistic vs unachievable

[Ilma]

English Language Tests, Intermediate level

ESL/EFL Test #216 "Antonyms (2)", question 4

After many months of grueling work and painful injuries to her shoulder and back, Susan realized that her dream of swimming the English Channel was unattainable. What is an antonym of unattainable? .........

(a) impossible
(b) unachievable
(c) realistic
(d) confused

English Language Tests, Intermediate level

ESL/EFL Test #216 "Antonyms (2)", answer 4

After many months of grueling work and painful injuries to her shoulder and back, Susan realized that her dream of swimming the English Channel was unattainable. What is an antonym of unattainable? realistic

Correct answer: (c) realistic
_________________________

Why not unachievable?

Ilma

[Yankee]

The test asks you to choose an antonym, Ilma. The word 'unachievable' is a synonym.