rất

Meaning

1. very

   adverb

   Before the adjective: rất vui. Lắm after the adjective means the same and sounds more conversational.

   • Phở này rất ngon.

     This phở is very good.

   • Hôm nay tôi rất bận.

     I'm very busy today.

   Grammar: Very: rất before the adjective