He was free-spirited and unrestrained, caring nothing for worldly rules.
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history
傥 is not used independently in modern Chinese. Its main survival is 倜傥 (dashing and unconventional). It also had a classical 'if' sense, the same role now carried by 倘, which shares the 党 phonetic.
register
Archaic and literary only, alive mainly inside the fixed compound, not in everyday speech.