noticeably, perceptibly

noiselessly, unnoticeably, unhurriedly, slowly, subtly, gradually, jerkily, effortlessly, inexorably, insidiously, glacially, perceptibly, gently, invisibly, soundlessly, wetly, languorously, fluidly, meditatively, unconsciously, sinuously, fixedly, tenderly, insensibly, lingeringly, ethereally, turbulently, languidly, translucently, inertly, hypnotically, vibrantly, pleasurably, sedately, unobtrusively, stealthily, spasmodically, elegantly, silently, unevenly, serenely, trembly, momentarily, unaffectedly, disconcertingly, circularly, inaudibly, sensually, sidewise, dreamily, cumbersomely, outwards, contemplatively, creakily, unrecognizably, progressively, candle flame, spontaneously, earthwards, sensuously, circumferentially, incrementally, transversely, diatonic scale, gracefully, beautifully, crystalline lens, mercurially, magically, mysteriously, ineluctably, absentmindedly, distractedly, minutely, delicately, indistinguishably, seamlessly, plastically, messily, fitfully, raggedly, blotting paper, perniciously, dizzily, infinitesimally, disjointedly, dispiritedly, powerlessly, lugubriously, tranquilly, sine curve, oppositely, implacably, forgivably, diffraction grating, interiorly, discreetly, remorselessly, unconcernedly, da capo, obtrusively, stiffly

glide, gradate

observably