serious
acting or speaking sincerely and in earnest;
demanding or characterized by
careful consideration or application;
severe in effect; bad
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serious (1-character)
sincere
sincerity
seriousness and honesty
solemn
serious
deep sincerity
in all seriousness
in all earnestness
formal and dignified
strict
serious and unrelenting
serious and grave
solemn and dignified
sedate and majestic
prudent
discreet
circumspect
take careful precautions
do something in a serious manner
earnest
serious
diligent
conscientious
serious
sincere
honorable
respectable
no-nonsense
important
to be critical, serious
appeal
request sincerely
serious, urgent, or heartfelt request