Definitions:

1. Considerably large. ADJECTIVE
   • We've come a right smart distance to visit you, so we'd appreciate it if you could take a little time off work on our behalf.
2. Idiomatic expression primarily used in some dialects in American English, particularly in the southern United States, referring to a considerable amount or degree. NOUN
   • There was a right smart crowd at the concert last night.
3. Quite attractive. ADJECTIVE
   • You look right smart in that dress.
4. Used to emphasize the size, extent, or degree of something. NOUN
   • He has a right smart amount of work to finish before the weekend.

Synonyms:

• a great deal
• considerable
• extensive
• hefty
• large
• Quite a bit
• significant
• sizeable
• substantial