What is another word for simple mindedness?

It depends which simple mindedness you mean. In the sense “a lack of penetration or subtlety”, the synonyms are simplicity, simpleness. Across all 1 sense there are 2 distinct synonyms, and they are not interchangeable with each other — this page lists them under the sense each one belongs to.

What is the opposite of simple mindedness?

WordNet records no antonym for simple mindedness. Antonymy in WordNet is a relation between specific word forms rather than between concepts, so it is recorded only where lexicographers judged the pairing direct. An absence here means none was recorded, not that none can be imagined.

Where do the synonyms for simple mindedness come from?

From Princeton University's WordNet, a lexical database maintained by lexicographers since 1985. A synonym here means a word form that shares a synset with this word — a set of forms interchangeable in one recorded context. Nothing on this page is generated by a language model.

Synonyms and antonyms

simple mindedness

nounRare

simple mindedness has 2 distinct synonyms spread across 1 of its 1 sense. Each sense below keeps its own list, because a synonym belongs to a meaning and not to a word: swapping one sense's substitute into another sense's sentence is how a thesaurus makes writing worse. WordNet records no antonym for it — antonymy is a relation between word forms rather than concepts, so it is deliberately sparse.

2
Distinct synonyms: 0
Antonyms: 1 of 1
Senses with a relation

Counts are distinct word forms across every sense. A synonym that appears under three senses is counted once here and shown three times below, under each sense it belongs to.