A
B
C
D
E
F
G
H
I
J
K
L
M
N
O
P
Q
R
S
T
U
V
W
X
Y
Z
unapproved (adj.)
[unapproved 词源字典]
early 15c., from
un-
(1) "not" + past participle of
approve
(v.).
[unapproved etymology, unapproved origin, 英语词源]