meticulous (adj.) Look up meticulous at Dictionary.com
1530s, "fearful, timid," from Latin meticulosus "fearful, timid," literally "full of fear," from metus "fear, dread, apprehension, anxiety," of unknown origin. Sense of "fussy about details" is first recorded in English 1827, from French méticuleux "timorously fussy." Related: Meticulosity.