<span>a : imperfect in form or function : faulty <span>replaced a defective light switch</span></span><span>b : falling below the norm in structure or in mental or physical function <span>defective eyesight</span> <span>a defective gene</span></span><span> 2<span> grammar : lacking one or more of the usual forms of inflection (see inflection 3) <span>Must is a defective verb.</span></span></span>defectively adverb defectiveness noun
.imperfect or faulty."complaints over defective goods"<span>synonyms:<span>faulty, flawed, imperfect, shoddy, inoperative, malfunctioning, out of order, unsound;<span>More</span></span></span>
The theme is that one should prioritize work before leisure. The ants did this and prepared for the winter, while the grasshopper did not and started having troubles because of this.
Every written piece comprises a central theme or subject matter. The manner in which a writer approaches this theme and subject is the tone. In this specific short story the tone is formal, sometimes informal and ironic.