smart
Sly or crafty (for two). Sharp, cunning, intelligent. (For three more)
Smart, intelligent, perceptive
Many people believe that creationism is a one word synonym for intelligent design. Though this is not true, I hope it may be the answer you are looking for.
That would be the word size.
That word would be disaster.
start
glare
now ?
amble
docile
A synonym for the word "inane" is idiotic. An antonym for "inane" is intelligent. Please see the related link below.
Wassailing