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
undoubted (adj.)
[undoubted 词源字典]
mid-15c., from
un-
(1) "not" + past participle of
doubt
(v.). Related:
Undoubtedly
.
[undoubted etymology, undoubted origin, 英语词源]
[undoubted 词源字典]