Rational (4)
'rational' is the definition.
(similar in meaning)
This is all the clue.
(Other definitions for sane that I've seen before include "In full possession of mental faculties" , "Normal" , "Rationable, sensible" , "Free from mental disorder" , "Rational" .)
'rational' is the definition.
(I've seen this in another clue)
This is all the clue.
(Other definitions for sober that I've seen before include "Unaffected by drink" , "Abstemious - grave" , "Serious; muted in colour" , "Abstinent" , "not moved" .)
'rational' is the definition.
(I've seen this in another clue)
This is all the clue.
(Other definitions for sound that I've seen before include "Safe" , "Noise; in good condition" , "place for sailing, perhaps" , "Fathom" , "Unimpaired" .)
'rational' is the definition.
(similar in meaning)
This is all the clue.
(Other definitions for logical that I've seen before include "Sound" , "having good reason" , "Showing rational thought" , "entirely reasonable" , "Deductive" .)
'rational' is the definition.
(synonyms)
This is the entire clue.
(Other definitions for reasonable that I've seen before include "Sound" , "Not excessive or extreme" , "Fair - inexpensive" , "description of rationality" , "Fair, rational" .)