A
Secret
B
Loathsome
C
Dislike
D
Hidden
Solution:
Loathsome is the synonym of Hideous.'Hideous' means extremely ugly or bad. E.g., She wears the most hideous colour combinations you could ever imagine. 'Secret' means something unknown. 'Loathsome' means extremely unpleasant. 'Dislike' means not liking someone/something. 'Hidden' means not known.
