Synonyms for Slow-witted:

adj.

dense (adjective)
simple.
retarded (adjective)
simple-minded, Feeble-minded, half-witted.
slow-witted (adjective)
dull, unintelligent.
thick (adjective)
slow.

n.

idiotic, soft, dull, simple-minded, Weak-minded, simple, silly, slow, Feeble-minded, ability. slow-witted (noun)
half-witted, unintelligent, feebleminded.

Other synonyms:

idiotic. simple-minded, Feeble-minded. silly, Weak-minded, dull. simple. slow. soft.