不稂不莠[bù láng bù yǒu]
词典比喻不成材) good-for-nothing
词典not injurious things：不稂不莠。
词典useless：无用的，无效的；无价值的；差劲的；不怎么样的。
词典worthless：无价值的，不值钱的；卑微的；不足取的，不足道的；不足轻重。
不稂不莠[bù láng bù yǒu]
（又作“不稂无莠”、“不郎不秀”; 比喻不成材） good-for-nothing; not injurious things; useless; worthless; unpromising
1. 不稂不莠不利不料不论不敏不鸣则已；一鸣惊人不摸门不宁唯是不平
Freedom from want; fear no shortage of material resources; not worry about running out of supplies
2. 不稂不莠不利不料不论不敏不鸣则已；一鸣惊人不摸门不宁唯是不平
Not to know the insidious approach of old age; not to know that old age is just around the corner