tasteless

形容词 tasteless:

1. lacking flavor
2. lacking aesthetic or social taste

1. It was tasteless of you to say that.
   你说那种话真是庸俗。
2. He thinks the vegetable is a bit tasteless.
   他觉得蔬菜没有什么滋味。
3. A colorless, odorless, tasteless, gaseous mixture, mainly nitrogen(approximately78 percent) and oxygen(approximately21 percent) with lesser amounts of argon, carbon dioxide, hydrogen, neon, helium, and other gases.
   空气一种无色、无嗅、无味的气体混合物，主要由氮气(约占78％)和氧气(约占21％)组成，还有少量的氩、二氧化碳、氢、氖、氦及其它气体
4. Gelatin is a clear tasteless substance.
   明胶是一种透明无味的物质。