in·sub·stan·tial /ˌɪnsəbˈstænʃəl◂/ adjectiveadj 1 formalBREAK not solid, large, strong, or definite 不坚实的;不大的;脆弱的;不明确的 The evidence seemed very insubstantial. 证据看起来很不可靠。
an insubstantial meal 不丰盛的一顿饭
the insubstantial outline of a ship 一艘船不清晰的轮廓
2 literaryAL not existing as a real object or person 非实体的;虚幻的 insubstantial ghosts 虚幻的幽灵
insubstantial• Epstein called the evidence insubstantial.