Answer: truest

AnswerCrossword Clue
TRUEST

Most constant.

TRUEST

Level best?

TRUEST

Least perfidious

TRUEST
Least apt to betray
TRUEST
Most dead on target
TRUESTMost on-the-mark
TRUESTStraightest, as an arrow
TRUESTLeast likely to betray
TRUESTMost blue?
TRUESTLike best friends
TRUESTMost veracious
TRUESTMost reliable
TRUESTLeast erroneous
TRUESTMost genuine.
TRUESTMost loyal.
TRUESTThe most reliable
TRUESTMost faithful.
TRUESTStraightest.
TRUESTMost reliable.
TRUESTMost sincere
TRUESTLoyal to the max
TRUESTMost dutiful
TRUESTLike a best friend
TRUESTMost authentic
TRUESTMost loyal
TRUESTLeast warped, as a beam
TRUESTMost accurate
TRUESTMost on the mark
TRUESTIncomparably faithful
TRUESTMost faithful