bil ‧ i ‧ ous /ˈbɪliəs/ BrE AmE adjective
[ Date: 1500-1600 ; Language: French ; Origin: bilieux , from Latin biliosus , from bilis ; ⇨ ↑ bile ]
1 . feeling as if you might ↑ vomit :
She felt a bilious attack coming on.
2 . very unpleasant:
bilious green walls
3 . literary bad-tempered
—biliousness noun [uncountable]