clear
rational
sane
Attic
Ciceronian
all there
apprehensible
balanced
beaming
bright
brilliant
chaste
classic
clean-cut
clear as crystal
clear as day
clear-cut
clearheaded
clearminded
cloudless
coherent
compos mentis
comprehensible
connected
consistent
crisp
crystal
crystal-clear
crystalline
defined
definite
diaphane
diaphanous
direct
distinct
easy
effulgent
elegant
explicit
express
fathomable
filmy
finished
fluent
gauzy
gossamer
gossamery
graceful
gracile
elucidate
accurate
concise
convince
eloquent
forcible
logical
luminous
masterly
readable
truthful
vivid