automatic, canned, concocted, fabricated, hokey, manufactured, pat, unauthentic, unreal, unrealistic

affected, artificial, assumed, bogus, contrived, factitious, fake, false, feigned, forced, mechanical, mock, phony (also phoney), plastic, pretended, pseudo, put-on, sham, simulated, spurious, strained, unnatural

double-dealing, empty, facile, hollow, hypocritical, insincere, left-handed, mealy, mealymouthed, two-faced, unctuous

exaggerated, histrionic, melodramatic, overacted, overdone, theatrical (also theatric)

cute, cutesy, genteel, goody-goody, mincing, overrefined, simpering

conventional, formal, impersonal, inflexible, rigid, stiff, stylized, wooden

artful, calculated, conscious, cultivated, deliberate, premeditated, studied

artless, genuine, natural, spontaneous, unaffected, uncontrived, unfeigned, unforced

authentic, bona fide, real, realistic, right, true

honest, ingenuous, sincere, unpretending

easy, effortless, smooth

extemporaneous, impromptu, impulsive, instinctive, unconscious, unprompted, unrehearsed, unstudied

banged away, beavered (away), drudged, dug (away), endeavored, fagged, grubbed, humped, hustled, moiled, pegged (away), plodded, plowed, plugged, slaved, slogged, strained, strove (also strived), struggled, sweat (or sweated), toiled, travailed, tugged, worked (or wrought)

applied (oneself), buckled (down), dug in, hammered (away), knuckled down, pitched in

attacked, drove

essayed, tried

exercised, exerted, overexerted, overworked

eked out, ground (out), put out, scrabbled, scratched

trudged, waded

sweat blood (or sweated ​blood)

broke, eased (up), let up, slackened

bummed, chilled, dallied, dillydallied, footled, goldbricked, goofed (off), hacked (around), hung (around or out) (also hanged ​(around ​or ​out)), idled, lazed, loafed, lounged, shirked, slacked (off), vegged out

basked, lolled, relaxed, reposed, rested, unwound

dabbled, doodled, fooled around, fribbled, goofed (around), hung (also hanged), hung about [British], messed around, monkeyed (around), played, pottered (around), puttered (around), trifled