tantalizing
adjective
[ ˈtantəlʌɪzɪŋ ]
• tormenting or teasing with the sight or promise of something unobtainable.
• "a tantalizing glimpse of the career he might have had"
tantalize
verb
• torment or tease (someone) with the sight or promise of something that is unobtainable.
• "such ambitious questions have long tantalized the world's best thinkers"
Origin:
late 16th century: from Tantalus + -ize.