Mousy

Adjective

 * 1) Resembling a mouse
 * 2) Quiet, stealthy
 * 3) Timid
 * 4) A greyish brown colour.
 * It's a god-awful small affair to the girl with the mousy hair David Bowie - Life on Mars? (1971)

Thesaurus
Quaker-colored, acier, afraid, ashen, ashy, bashful, brown, brownish, canescent, chicken, chickenhearted, cinereous, cinerous, colorless, confused, conscious, coward, cowardly, cowed, cowering, coy, dapple, dapple-gray, dappled, dappled-gray, daunted, demure, diffident, dingy, dismal, dismayed, dove-colored, dove-gray, drab, dreary, dull, dun, dusty, echoless, fainthearted, fearful, fearing, fearsome, flat, funking, funky, glaucescent, glaucous, goosy, gray, gray-black, gray-brown, gray-colored, gray-drab, gray-green, gray-spotted, gray-toned, gray-white, grayed, grayish, grey, griseous, grizzle, grizzled, grizzly, henhearted, hush as death, hushed, in fear, inarticulate, inaudible, intimidated, iron-gray, jumpy, lead-gray, leaden, lily-livered, livid, milk-livered, milksoppish, milksoppy, mouse-colored, mouse-gray, mouselike, mousey, nervous, noiseless, overtimid, overtimorous, panic-prone, panicky, pearl, pearl-gray, pearly, pigeonhearted, plain, quiescent, quiet, rabbity, ratty, rodent, rodential, sad, scary, self-conscious, self-effacing, shaky, shamefaced, shamefast, shivery, shrinking, shy, silent, silver, silver-gray, silvered, silvery, sissified, sissy, skittery, skittish, slate-colored, slaty, smoke-gray, smoky, sober, soft, somber, soundless, stammering, startlish, steel-gray, steely, still, still as death, stilly, stone-colored, subaudible, taupe, timid, timorous, trembling, tremulous, trepidant, trigger-happy, unarticulated, unhearable, unmanly, unmanned, unpronounced, unsounded, unuttered, unvocalized, unvoiced, verminous, weak, weak-kneed, weakhearted, whist, white-livered, yellow

Alternative forms

 * mousey

Etymology
From