Sturdy
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wishy-washy, mild, tottering, susceptible, diseased, insecure, infirm, weak-kneed, feeble, rickety, vulnerable, spineless, easy, worn-out, moderate, small, diffident, characterless, tiny, uncertain, unsound, crippled, unhealthy, emasculated, listless, weak, unresistant, temporary, skinny, transient, unstable, delicate, perishable, shaky, soft, tottery, mortal, spiritless, incapacitated, resistless, thin, puny, wobbly, flabby, yielding, sensitive, calm.