📘 English Definition（英文释义）
- a having undesirable or negative qualities
- s very intense
- s feeling physical discomfort or pain (`tough' is occasionally used colloquially for `bad')
- s (of foodstuffs) not in an edible or usable condition
- a feeling or expressing regret or sorrow or a sense of loss over something done or undone
- s not capable of being collected
- s below average in quality or performance
- s nonstandard
- s not financially safe or secure
- s physically unsound or diseased
- s capable of harming
- s characterized by wickedness or immorality
- s reproduced fraudulently
- s not working properly