膨ぼう大だい

na-adjective

huge; vast; enormous; extensive

A na-adjective for an amount, quantity, scale, data set, cost, workload, etc. being extremely large. It often implies that the size is hard to handle or take in.

• この研けん究きゅうには膨ぼう大だいな資し料りょうを読よむ必ひつ要ようがある。

  This research requires reading a vast amount of material.

• ネット上じょうには膨ぼう大だいな情じょう報ほうがある。

  There is an enormous amount of information online.

noun, noun or participle which takes 'suru', intransitive verb

swelling; expansion; expand greatly

Only when written 膨大

Less common noun and intransitive する-verb use, restricted to the spelling 膨大. In modern writing, 膨張する, 膨らむ, or 増大する may be more natural depending on the context.

• 計けい画かくが長なが引びくにつれて、経けい費ひが膨ぼう大だいしていった。

  As the project dragged on, the expenses kept expanding.