used to describe something that is very basic, simple, and not well developed

The organization is criticized for its surly service and stone-age software. 这家机构因其恶劣的服务态度和落伍的软件系统而受到批评。

the early period in human history when people made tools and weapons only out of stone

a Stone Age settlement/site 石器时代居住点／遗址

figurative My grandma's TV looks like something out of the Stone Age (= is very old-fashioned)! 我奶奶的电视机看起来就像是来自于石器时代的东西。