ясный

1) General subject: articulate, bright (о звуке), broad, candid, categoric, categorical, clear (об уме), clear to (smb.) (кому-л., для кого-л.), cloudless, coherent, direct, distinct, downright, elegant, evident, explicative, explicit, express, fair, fine, fogless, intelligible, light, limpid, lucid, luculent, luminous, manifest, neat, nude, obvious, orotund (о дикции), pellucid, pellucid (об уме), perspicuous, plain, precise, precise (о слове, выражении), presentable, pronounced, pure (о звуке), robust, rosy, self explanatory, self-evident, self-explanatory, serene, set fair (о погоде), shiny, silvery, silvery (о тоне), straightforward, strong, telescopic, translucid, transparent, transpicuous, trenchant, understandable, undimmed, unequivocal, univocal, unmistakable, unmistakeable, unobscured, unshadowed, up-and-down, vivid, water fast, water-fast, definite, determinate, (звук или изображение) focused (from Macmillan Dictionary), conspicuous

2) Agriculture: fair (о погоде)

3) Mathematics: natural

4) Law: positive

5) Economy: accountable

6) Architecture: clayey features

7) Diplomatic term: overt

8) Psychology: comprehensible, eminent

9) Oil: unblurred

10) Makarov: categorial, clean, clean-cut, cloudless (о погоде), flat, lucid (светлый), matter-of-course, tangible, translucent (для понимания), watertight

11) Phraseological unit: bright-line rule