senpera

Two prepositions, one adjective. Sen at 169 is without and per at 30 is by means of, and Esperanto lets you weld them together and hang an ending on the result. Sen-per-a is therefore "without-by-means-of", which sounds absurd in English and is exactly right: something senpera reaches you with no intermediary, no agent, no middle step. The per inside it is the same little word you use every day in per aŭto and per letero, doing the same job.

The root it implies does not have a page here. Pero is mediation or agency, peri is to mediate, and a peranto is a middleman or a broker; none of the three made the top 3,000, so you will meet the family through this adjective first. Worth knowing anyway, because per la pero de (through the agency of) is a common phrase, and senpera is precisely its negation.

Not quite rekta. Rekta at 518 is straight: a straight line, a direct train, a route with no detour. Senpera is about who or what stands in between. A rekta answer is a blunt one; a senpera answer comes from the person themselves rather than through somebody else. A senpera sperto is first-hand experience, senpera kaŭzo is the immediate cause as opposed to the underlying one, and the adverb senpere is how the word most often appears. The two are near neighbours and not synonyms, and the difference is worth holding on to: one is about the shape of the path, the other about how many hands the thing passed through.