active, alight, alive, animate, ardent, assiduous, attentive, avid, bouncing, bright, brisk, bustling, certain, changeless, confident, constant, crisp, crispy, dead, dependable, devout, diligent, eager, earnest, endless, eternal, fervid, firm, firmed, foolproof, gay, hard-boiled, hard-core, hardboiled, hardcore, hardy, high, high-spirited, immediate, immune, immutable, impervious, inalterable, incessant, industrious, insistent, insusceptible, invariable, invariant, inveterate, keen, laborious, lasting, leisure, live, lively, livestock, living, mobile, non-volatile, nonconvertible, obstinate, persistent, pertinacious, positive, pressing, proof, quick, reliable, resilient, resistant, resistible, safe, sanguine,
secure, sedulous, severe, snappy, solid, sprightly, spry, stanch, stare, stationary, steadfast, strenuous, stubborn, studious, substantial, sure, sureness, tableau, tenacious, thrifty, tolerant, trusty, unalterable, unchangeable, unchanging, undoubted, unimpeachable, unquestionable, unrelenting, unshakeable, unswerving, unvaried, urgency, urgent, vivacious, vivid, warm, wrong-headed, wrongheaded, zealous, zealousness