Serious (5)
'serious' is the definition.
(sober can mean sensible or serious)
This is all the clue.
(Other definitions for sober that I've seen before include "Serious; muted in colour" , "Sensible - clear-headed" , "Serious - sombre" , "Abstemious - grave" , "Serious, dull" .)
'serious' is the definition.
(I've seen this before)
This is all the clue.
(Other definitions for staid that I've seen before include "Stuffy, traditional" , "Sedate, unadventurous" , "Sedate, sober" , "Stiff; serious minded" , "Sedate; dull" .)
'serious' is the definition.
(acute can mean serious in a medical sense)
This is all the clue.
(Other definitions for acute that I've seen before include "Sharp - sort of French accent" , "not seen in cafe here!" , "Very perceptive, having sharp mind" , "Grave" , "(Of an angle) less than 90 degrees" .)
'serious' is the definition.
(I've seen this in another clue)
This is the entire clue.
(Other definitions for stern that I've seen before include "Severe part of the ship?" , "having a forbidding appearance" , "Grim, strict" , "Demanding < back" , "Severe and unremitting: area of a ship" .)
'serious' is the definition.
(I've seen this in another clue)
This is the entire clue.
(Other definitions for major that I've seen before include "See 2" , "Important, significant" , "5,27 [PRIME MINISTER]" , "Army rank" , "Main course" .)
'serious' is the definition.
(both can mean solemn)
This is the entire clue.
(Other definitions for grave that I've seen before include "Solemn in a cemetery?" , "Solemn, serious" , "Dignified" , "Sombre in the sepulchre" , "In which to lay a corpse" .)
'serious' is the definition.
(similar in meaning)
This is all the clue.
(Other definitions for solemn that I've seen before include "Marked by pomp, cermony or formality" , "Serious and formal" , "gloomy" , "Stately, pompous or glum" , "'Sedate, grave (6)'" .)
'serious' is the definition.
(I know that serious can be written as severe)
This is the entire clue.
(Other definitions for severe that I've seen before include "Formal - unsmiling" , "Strict and unbending" , "Unsparing and uncompromising" , "Drastic" , "Harsh, rigorous" .)
'serious' is the definition.
(similar in meaning)
This is all the clue.
(Other definitions for earnest that I've seen before include "Art worthy" , "Serious in intention" , "art collector" , "Serious - money deposit" , "Nearest (anag.)" .)