dubitable

The authenticity of the painting is dubitable, as experts have questioned its origin.

用法提示：形容词dubitable作表语，表示主语the authenticity具有可疑的性质。

His explanation for being late seemed dubitable, so I asked for more details.

用法提示：形容词dubitable作表语，描述explanation的可疑程度。

The report's conclusions are dubitable given the lack of solid evidence.

用法提示：形容词dubitable作表语，强调conclusions因证据不足而不可靠。