Strenuous. Eager, pressing, urgent; zealous, ardent, earnest; bold, intrepid; strong, determined, resolute; vigorous, energetic, vehement, forceful.
Ant. Weak, irresolute, vacillating, wavering, enervated, undetermined.
Strong. Powerful, cogent, muscular; robust, lusty, sinewy, hale, hearty, vigorous, forceful; enduring, resistant; violent, forcible; ardent, zealous, vehement, earnest, solid, nourishing; firm; capable, potent, effective, influential, sound; pungent; hardy, tenacious.
Ant. Weak, feeble, infirm, sickly, exhausted, debilitated, wanting, pliant, frail, soft; low, faint; spiritless, foolish; wavering, impotent, powerless, defenseless, insecure, delicate; unefficacious, unconvincing, unsatisfactory, unavailing, flaccid, nerveless.
Stubborn. Obstinate, inflexible, obdurate, headstrong, harsh, intractable, firm, contumacious, heady; unbending, unyielding, persistent, refractory.
Ant. Yielding, pliant, mild, gentle, docile, tractable, manageable, flexible, pliable; vacillating, wavering, irresolute, undecided.
Studious. Contemplative, observant; sedulous, earnest, diligent; studied; absorbed, meditative, thoughtful, attentive, pondering, devoted, musing, cogitative; careful, literary, reflective, assiduous.
Ant. Illiterate, unliterary, idle, indulgent, careless, inattentive, thoughtless, negligent, regardless, indifferent.
Study, n. Application, learning, acquisition, meditation, contemplation; diligence, consideration, thought, research, endeavor, knowledge, purpose, intention, attention, concentration.
Ant. Idleness, dawdling, illiteracy, ease, indifference, indiligence, negligence, carelessness, unstudiousness, thoughtlessness.