同義詞
1. done, given, or acting of one's own free will
- optional
- , discretionary
- , at one's discretion
- , elective
- , non-compulsory
- , non-mandatory
- , not required
- , open
- , open to choice
- , volitional
- , up to the individual
- , permissive
- , discretional
2. working, done, or maintained without payment
- unpaid
- , unsalaried
- , without pay
- , without payment
- , free of charge
- , without charge
- , for nothing
- , for free
- , honorary
- , volunteer
- , unrewarded
- , pro bono (publico)
反義詞
「1. done, given, or acting of one's own free will」的反義字
「2. working, done, or maintained without payment」的反義字