No it isn't; the two words have entirely different meanings.
The best synonym for vacuous is 'intelligent'
Clever Intelligent
Intelligent
Analytical, intelligent, pertinent, etc.
no it is not... "ponder" and "wonder", however, are
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.
smart
A synonym for "intelligent" is "smart." Other synonyms include "wise," "brilliant," and "clever." These words convey a similar meaning related to the ability to think, understand, and learn effectively.
Perceptive, intelligent, clever, savvy, perspicacious, canny, sharp...
Genius Intellectual Smart Academic brilliant brainy intelligent
A synonym for the word "inane" is idiotic. An antonym for "inane" is intelligent. Please see the related link below.