Active, agile, alert, brisk, bustling, energetic, lively, supple.
Actual, authentic, genuine, real.
Adept, adroit, deft, dexterous, handy, skilful.
Address, adroitness, courtesy, readiness, tact.
Adequate, competent, equal, fitted, suitable.
Adjacent, adjoining, bordering, near, neighboring.
Admire, adore, respect, revere, venerate.
Admit, allow, concede, grant, suffer, tolerate.
Admixture, alloy.
Adverse, disinclined, indisposed, loath, reluctant, slow, unwilling.