1-phambene(yo)-ligezaIs it true that he's mad? — Ngaba yinyani ukuba uphambene?
2ngokungekho sikweni-phambeneYou were mad to buy that car — Ubuphambene ukuba ungathenga laa moto→ Synonym of silly
3ngokungekho sikweni-nomsindoDad's mad with me because I'm late — Utata unomsindo ngenxa yokuba ndibuye kade→ Synonym of angry
For senses 2 and 3, use 'silly' or 'angry' in formal speaking and writing.