unobtrusive, unintrusive, obtrusive, user friendly, discreet, observant, intelligent, intrusive, thoughtful, nonreflective, accessible, noninvasive, considerate, nonthreatening, interrelating, unrushed, respectful, trackable, unnoticeable, photoconductive, convenient, deflectable, pleasant, nonvisual, painless, attentive, nosier, unobstructed, subtle, intelligible, pleasurable, inexpensive, passive, nurturant, readable, simple, straightforward, snowl, polite, unobservant, nonaggressive, helpful, elaborative, nonjudgmental, clever, multiplane, nonhierarchical, intuitive, efficient, tasteful, responsive, commonsensical, esthetical, sophisticated, visual, noiseless, imperceptible, hypertext transfer protocol, spectrographic analysis, parabolic reflector, omnidirectional, minimal, conscientious, interruptive, viewable, practical, semipermeable membrane, swallowable, useful, informative, interactional, sensible, inoffensive, mitigative, speech intelligibility, psychophysical, panoptic, teredo, infrasonic, beneficial, tridimensional, unobscured, communicative, purposeful, unproblematic, sunblind, graspable, liveness, purposive, egress, smart, feasible, peaceable, infrared ray, fluoroscopic, unostentatious, uncluttered, compact, gentle, aggregative, veridical, galvanic skin response, nondestructive, automated, manipulative, semiquantitative, interventive, invasive, problemsolving, summative, adjunctive, appropriate, calorimetric, chronometric, costeffective, efficacious, expedient, foolproof, heuristic