Firsthand

Adjective

 * 1) Direct, without intermediate stages.
 * firsthand knowledge
 * 1) Brand new, as opposed to used or secondhand.

Thesaurus
absolute, adducible, admissible, attestative, attestive, authentic, avant-garde, based on, callow, certain, circumstantial, conclusive, convincing, creative, cumulative, damning, decisive, determinative, dewy, documentary, documented, ever-new, evergreen, evidential, evidentiary, ex parte, eye-witness, factual, final, fledgling, founded on, fresh, green, grounded on, hearsay, imaginative, immature, immediate, implicit, incontrovertible, indicative, indisputable, intact, irrefutable, irresistible, maiden, maidenly, material, neoteric, nestling, new, novel, nuncupative, original, overwhelming, presumptive, primary, pristine, probative, raw, reliable, revolutionary, sempervirent, significant, suggestive, sure, symptomatic, telling, unbeaten, underived, undeveloped, unfledged, unhandled, unique, untouched, untried, untrodden, unused, valid, vernal, virgin, virginal, weighty, young

Alternative forms

 * first hand, first-hand