1.  slowness(n = noun.cognition) awkwardness, clumsiness, ineptitude, ineptness, maladroitness - unskillfulness resulting from a lack of training;
is a kind of unskillfulness
has particulars: rustiness
Derived form adjective slow₃

2.  slowness(n = noun.attribute) deliberateness, deliberation, unhurriedness - a rate demonstrating an absence of haste or hurry;
is a kind of pace, rate
has particulars: leisureliness, dilatoriness, procrastination
Derived forms adjective slow₁, adjective slow₂

3.  slowness(n = noun.cognition) backwardness, mental retardation, retardation, subnormality - lack of normal development of intellectual capacities;
is a kind of stupidity
has particulars: abnormality, mental defectiveness, mental deficiency, moronity, amentia, idiocy, imbecility
Derived form adjective slow₃

   The quality or state of being slow. [1913 Webster]

N  unwillingness, indisposition, indisposedness, disinclination, aversation, nolleity, nolition, renitence, renitency, reluctance, indifference, backwardness, slowness, want of alacrity, want of readiness, indocility, scrupulousness, scrupulosity, qualms of conscience, twinge of conscience, delicacy, demur, scruple, qualm, shrinking, recoil, hesitation, fastidiousness, averseness, dissent, refusal, unwilling, not in the vein, loth, loath, shy of, disinclined, indisposed, averse, reluctant, not content, adverse, laggard, backward, remiss, slack, slow to, indifferent, scrupulous, squeamish, repugnant, restiff, restive, demurring, unconsenting, involuntary, unwillingly, grudgingly, with a heavy heart, with a bad, with an ill grace, against one's wishes, against one's will, against the grain, sore against one's wishes, sore against one's will, sore against one's grain, invita Minerva, a contre caeur, malgre soi, in spite of one's teeth, in spite of oneself, nolens volens, perforce, under protest, no, not for the world, far be it from me.

N  diuturnity, a long time, a length of time, an age, a century, an eternity, slowness, perpetuity, blue moon, coon's age, dog's age, durableness, durability, persistence, endlessness, lastingness, continuance, standing, permanence, survival, survivance, longevity, distance of time, protraction of time, prolongation of time, extension of time, delay, durable, lasting, of long duration, of long-standing, permanent, endless, chronic, long-standing, intransient, intransitive, intransmutable, persistent, lifelong, livelong, longeval, long-lived, macrobiotic, diuturnal, evergreen, perennial, sempervirent, sempervirid, unrelenting, unintermitting, unremitting, perpetual, lingering, protracted, prolonged, spun out, long-pending, long-winded, slow, long, for a long time, for an age, for ages, for ever so long, for many a long day, long ago, longo intervallo, all the day long, all the year round, the livelong day, as the day is long, morning noon and night, hour after hour, day after day, for good, permanently.

N  slowness, languor, drawl, creeping, lentor, retardation, slackening, delay, claudication, jog trot, dog trot, mincing steps, slow march, slow time, slow goer, slow coach, slow back, lingerer, loiterer, sluggard, tortoise, snail, poke, dawdle, slow, slack, tardy, dilatory, gentle, easy, leisurely, deliberate, gradual, insensible, imperceptible, glacial, languid, sluggish, slow paced, tardigrade, snail-like, creeping, reptatorial, slowly, leisurely, piano, adagio, largo, larghetto, at half speed, under easy sail, at a foots pace, at a snail's pace, at a funeral pace, in slow time, with mincing steps, with clipped wings, haud passibus aequis, gradually, gradatim, by degrees, by slow degrees, by inches, by little and little, step by step, one step at a time, inch by inch, bit by bit, little by little, seriatim, consecutively, dum Roma deliberat Saguntum perit, at a glacial pace.