overgenerous
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/ˌəʊvərˈdʒenərəs/
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/ˌəʊvəˈdʒenərəs/
excessively giving or providing more than necessary
He was overgenerous with his time, often helping others at his own expense.
他在時間上過於慷慨,常常以自己的代價幫助他人。