| biconvex | (adjective) convex on both sides; shaped like a lentil | Synonyms: convexo-convex, lenticular, lentiform |
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| convex | (adjective) curving or bulging outward | Synonyms: bulging |
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| planoconvex | (adjective) flat on one side and convex on the other | - |
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| vexatious | (adjective) causing irritation or annoyance | Synonyms: annoying, bothersome, galling, irritating, nettlesome, pesky, pestering, pestiferous, plaguey, plaguy, teasing, vexing |
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| vexed | (adjective) causing difficulty in finding an answer or solution; much disputed | - |
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| (adjective) troubled persistently especially with petty annoyances | Synonyms: annoyed, harassed, harried, pestered |
| vexing | (adjective) causing irritation or annoyance | Synonyms: annoying, bothersome, galling, irritating, nettlesome, pesky, pestering, pestiferous, plaguey, plaguy, teasing, vexatious |
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| (adjective) extremely annoying or displeasing | Synonyms: exasperating, infuriating, maddening |