1 sound in mind; free from mental disturbance
2 having or showing reason, good judgment, or sound sense
3 Obsolete healthy
(C17: from Latin sanus healthy)
English Collins Dictionary - English Definition & Thesaurus
1 all there (informal) compos mentis, in one's right mind, in possession of all one's faculties, lucid, mentally sound, normal, of sound mind, rational
2 balanced, judicious, level-headed, moderate, reasonable, sensible, sober, sound
bonkers (slang, chiefly Brit.) crackpot (informal) crazy, daft (informal) doolally (slang) foolish, insane, loony (slang) loopy (informal) mad, mentally ill, non compos mentis, nuts (slang) off one's head (slang) off one's trolley (slang) out to lunch (informal) round the bend or twist (slang) stupid, unreasonable, unsound, up the pole (informal) wacko or whacko (informal)
English Collins Dictionary - English synonyms & Thesaurus
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"Collins English Dictionary 5th Edition first published in 2000 © HarperCollins Publishers 1979, 1986, 1991, 1994, 1998, 2000 and Collins A-Z Thesaurus 1st edition first published in 1995 © HarperCollins Publishers 1995"