We have put together a list of words that are similar to FIRSTHAND.

1 Alternative Words Similar to firsthand

1 Primary Adjective      Similar Words Like Primary

2 definitions of firsthand

1 Received from the original source: firsthand information.
2 Direct, without intermediate stages.
We get our data from many different dictionaries across the web:
Wordnik, Wiktionary, Century, American Heritage, Gcide