As a noun gwaai
is (haida ) eldest son.
As an adjective kwaai is
bad-tempered.
gwaai
English
Noun
(Haida ) eldest son
(South African English) cigarette
kwaai
English
Adjective
(
en adjective)
bad-tempered
aggressive
(slang) cool (excellent)
References
*OED (online) 2007