* Expressing doubt: "I was sceptical of his claims about winning the lottery."
* Showing a questioning attitude: "She remained sceptical throughout the presentation, asking pointed questions."
* Highlighting a lack of belief: "The jury were sceptical about the defendant's alibi."
* Describing a personality trait: "He's a naturally sceptical person, always questioning assumptions."
* In a more formal context: "The scientific community maintained a sceptical stance towards the new theory until further evidence emerged."
The best way to use "sceptical" depends on the specific nuance you want to convey. Remember that it implies doubt or questioning, not necessarily outright disbelief.