Synonyms for Slow-witted:

adj.

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

n.

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

Other synonyms:

idiotic. simple-minded, Feeble-minded. dull, silly, Weak-minded. simple. slow. soft. Other relevant words:
dull, idiotic, silly, simple, simple-minded, slow, soft, Feeble-minded, Weak-minded.