"stupider" in the adjective sense
lacking or marked by lack of intellectual acuity
2. dazed, stunned, stupefied, stupid
in a state of mental numbness especially as resulting from shock
"he had a dazed expression on his face"
"lay semiconscious, stunned (or stupefied) by the blow"
"was stupid from fatigue"
3. unintelligent, stupid
"a dull job with lazy and unintelligent co-workers"
Source: WordNet® (An amazing lexical database of English)
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