a.

1. 极多的，无数的
   multitudinous questions

   许许多多问题

2. 由许多部分组成的；种类繁多的
   I heard again the multitudinous murmur of the city.

   我又听到了城市里各种各样的嗡嗡声。

3. 拥挤的；人数众多的
   the multitudinous streets

   拥挤的街道

adj.

1. very numerous.
   ▸consisting of many individuals or elements.
2. literary (of a body of water) vast.