1. (家具、服装、房屋装修等)俗气的，难看的，没品位的
If you describe something such as furniture, clothing, or the way that a house is decorated as tasteless, you consider it to be vulgar and unattractive.

2. (话语、玩笑等)粗俗的，不雅的，不得体的
If you describe something such as a remark or joke as tasteless, you mean that it is offensive.

3. (食物、饮料)淡而无味的，没滋味的
If you describe food or drink as tasteless, you mean that it has very little or no flavour.

1. lacking aesthetic or social taste

2. lacking flavor