Adequate, adjective: Sufficient, enough, requisite; acceptable, passable, reasonable, satisfactory, tolerable, fair, decent, quite good, pretty good, moderate, unexceptional, unremarkable, undistinguished, ordinary, average, not bad, all right, middling; informal OK, so-so, 'comme ci, comme ça', fair-to-middling, nothing to write home about; equal to, up to, capable of, suitable for, able to do, fit for, sufficient for.
Explosive, adjective: Volatile, inflammable, flammable, combustible, incendiary; fiery, stormy, violent, volatile, angry, passionate, tempestuous, turbulent, touchy, irascible, hotheaded, short-tempered; tense, charged, highly charged, overwrought; dangerous, perilous, hazardous, sensitive, delicate, unstable, volatile; sudden, dramatic, rapid; mushrooming, snowballing, escalating, rocketing, skyrocketing, accelerating.
Parasite, noun: Hanger-on, cadger, leech, passenger; informal bloodsucker, sponger, bottom feeder, scrounger, freeloader, mooch.
With each new conversation
The explosive behavior
Was a parasite
Which was once sub-adequate behavior