freethinking freethinker • free-thinking · · · Info · Definitions · Synonyms · Characters · · freethinking · · Text Latin · · Script 12 · · Length 3 · · Syllables Definitions · · · (noun) the doctrine that reason is the right basis for regulating conduct. Synonyms: rationalism. · · Noun Definition 1 Synonyms · · · rationalism · · Synonym 1 Characters · · e latin small letter e U+0065 f latin small letter f U+0066 g latin small letter g U+0067 h latin small letter h U+0068 i latin small letter i U+0069 k latin small letter k U+006B n latin small letter n U+006E r latin small letter r U+0072 t latin small letter t U+0074