inscrutableness, n. impenetrability, impenetrableness, incomprehensibility, incomprehensibleness, inscrutability; poker face, dead pan, sphinx, Mona Lisa smile; mysteriousness, mystery, inexplicability, inexplicableness, unexplainableness, insolvability, insolubility, insolubleness; darkness, obscurity, obscureness, dimness, vagueness, nebulousness; uncertainty, ambiguity; unfathomableness, unknowableness, unknowability, indecipherability, indecipherableness; impassivity, unexpressiveness, expressionlessness.
insect, n. 1. bug, mite, vermin, hexapod, arachnid, arthropod, ephemera; fly, housefly, face fly, blowfly, bluebottle fly, fruit fly, may fly, vinegar fly, tsetse fly; gnat, flea, no-see-um, earwig, water bug; mosquito, wasp, tick, bedbug, weevil, beetle, stinkbug, locust, grasshopper, termite, cockroach, silverfish; ant, pismire, Chiefly Dial, emmet, spider, cricket, bee, moth, butterfly, dragonfly, ladybug.
2. cur, wretch, pariah; All Inf. grub, creep, worm, mutt, jerk, schmuck; All Inf. pantywaist, jellyfish, milquetoast, Caspar Milquetoast, Walter Mitty.
insecticide, n. bug spray, insect powder, poison, con tact poison, fumigant, chemosterilant; pesticide, miti-cide, acaricide, vermicide, anthelmintic; roach powder, roach paste, Inf. bug bomb, Inf. bugstrip.
insecure, adj. 1. unsafe, unsound, unstable, untrustworthy, unreliable; precarious, dangerous, perilous, hazardous, ticklish, risky, chancy, slippery, hanging by a thread, Sl. hairy.
2. vulnerable, open, susceptible, assailable, unprotected, defenseless; exposed, unsheltered, unshielded, ill-protected, unguarded; endangered, in danger, ex-pugnable, not out of the woods, between the devil and the deep blue sea.
3. infirm, shaky, wobbly, unsteady, decrepit, not firm, weak, frail, flimsy, unsubstantial; wobbling, tottering, teetering, rickety.
4. diffident, uncertain, doubtful, hesitant, dubious, undecided, not sure; dismayed, disconcerted, lacking confidence, not confident, unsure, timid; apprehensive, restive, shaken, unnerved, wrung; tremulous, fearful, uneasy, skittish, jumpy, nervous.
insecurity, n. 1. instability, weakness, frailty, precariousness, danger, jeopardy, hazard, peril, risk, riskiness, chancefulness, chanciness.
2. vulnerability, susceptibility, assailableness, defenselessness; exposure, openness to attack, imperilment.
3. self-doubt, diffidence, timidity, timorousness, apprehension, faintheartedness; bashfulness, shyness, abashment, embarrassment, sheepishness; lack of selfconfidence, reluctance, hesitancy, doubtfulness, backwardness; self-consciousness, constraint, uncertainty, incertitude, doubt, misgiving, hesitation, dubiousness, dubiety; irresolution, wariness, leeriness, fear, anxiety.
inseminate, v. 1. sow seed, inject seed into, plant, implant, set, sow, seed, seed down; fertilize, spermatize, pollinate, pollinize, cross-fertilize, cross-pollinate, cross-pollinize; breed, propagate, proliferate, multiply.
2. impregnate, make pregnant, get with child or young, Sl. knock up; fructify, make fruitful, fecundate; create, procreate, generate, beget, get, engender.
3. give rise to, give being to, bring or call into existence, hatch; start, begin, establish, introduce, initiate, launch, originate; invent, occasion, Inf. sow the seeds of, found, establish, institute, lay the foundation of; inspire, provide the inspiration for, motivate, provide the motivation for, incite, kindle, Inf. spark, light the spark of; evoke, inculcate, indoctrinate, inoculate, infuse, instill, imbue.
insensate, adj. 1. unfeeling, sensationless, numb, insensible, insentient, unperceiving, unconscious, comatose, anesthetized, Inf. out, Inf completely out, Inf. zonked.