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discourteous, ill-bred, ill-mannered, impolite, inconsiderate, rude, thoughtless, uncivil, ungracious, unmannerly—more at IMPOLITE

im·per·turb·able adjective : marked by extreme calm, impassivity, and steadiness

Synonyms

nerveless, unflappable, unshakable—more at UNFLAPPABLE

im·per·vi·ous adjective 1 : incapable of being penetrated (as by moisture)

2 : not capable of being affected or disturbed <~ to criticism>

Synonyms

impenetrable, tight—more at TIGHT

im·pe·ti·go noun : a contagious skin disease characterized by vesicles, pustules, and yellowish crusts

im·pet·u·ous adjective 1 : marked by impulsive vehemence <~ temper>

2 : marked by force and violence

— im·pet·u·os·i·ty noun

— im·pet·u·ous·ly adverb

im·pe·tus noun [ORIGIN: L, assault, impetus, fr. impetere to attack, fr. petere to go to, seek]

1 : a driving force : IMPULSE; also : INCENTIVE

2 : MOMENTUM

Synonyms

boost, encouragement, goad, impulse, incentive, incitement, instigation, momentum, motivation, provocation, spur, stimulus, yeast—more at IMPULSE

im·pi·e·ty noun, plural -ties 1 : the quality or state of being impious

2 : an impious act

Synonyms

blasphemy, defilement, desecration, irreverence, sacrilege—more at BLASPHEMY

im·pinge verb im·pinged; im·ping·ing 1 : to strike or dash esp. with a sharp collision

2 : ENCROACH, INFRINGE

— im·pinge·ment noun

im·pi·ous adjective : not pious : IRREVERENT, PROFANE

imp·ish adjective : of, relating to, or befitting an imp; especially : MISCHIEVOUS

— imp·ish·ly adverb

— imp·ish·ness noun

Synonyms

devilish, knavish, mischievous, rascally, roguish, sly, waggish, wicked—more at MISCHIEVOUS

imp·ish·ness noun : the quality or state of being impish

Synonyms

friskiness, mischief, mischievousness, playfulness—more at PLAYFULNESS

im·pla·ca·ble adjective : not capable of being appeased, pacified, mitigated, or changed

— im·pla·ca·bil·i·ty noun

— im·pla·ca·bly adverb

Synonyms

adamant, hard, immovable, inflexible, pat, rigid, unbending, uncompromising, unrelenting, unyielding

im·plant verb 1 : to set firmly or deeply

2 : to fix in the mind or spirit

3 : to insert in living tissue (as for growth or absorption)

— im·plant noun

— im·plan·ta·tion noun

Synonyms

embed, entrench, fix, ingrain, lodge, root—more at ENTRENCH

im·plau·si·ble adjective : not plausible

— im·plau·si·bil·i·ty noun

— im·plau·si·bly adverb

Synonyms

fantastic, inconceivable, incredible, unbelievable, unconvincing, unimaginable, unthinkable—more at INCREDIBLE

1implement noun [ORIGIN: ME, fr. AF, fr. ML implementum item making a full complement, appurtenance, tool, fr. LL, act of filling up, fr. L implēre to fill up]

: a device used in the performance of a task : TOOL, UTENSIL

Synonyms

device, instrument, tool, utensil; also apparatus, appliance, mechanism; contraption, contrivance, gadget, gizmo, jigger

2implement verb 1 : to put into execution or bring to completion

2 : to provide implements for

Synonyms

administer, apply, enforce, execute—more at ENFORCE

im·ple·men·ta·tion noun : the act of implementing or the state of being implemented

Synonyms

accomplishment, achievement, commission, discharge, enactment, execution, fulfillment, performance, perpetration—more at COMMISSION

im·pli·cate verb -cat·ed; -cat·ing 1 : IMPLY

2 : INVOLVE

— im·pli·ca·tion noun

im·plic·it adjective 1 : understood though not directly stated or expressed : IMPLIED; also : POTENTIAL

2 : COMPLETE, UNQUESTIONING, ABSOLUTE <~ faith>

— im·plic·it·ly adverb

Synonyms

potential, tacit, unexpressed, unspoken, unvoiced, wordless; also inferred; unannounced, undeclared, unsaid, untold; intimated, suggested

Antonyms

explicit, express, expressed, spoken, stated

im·plode verb im·plod·ed; im·plod·ing 1 : to burst or collapse inward

2 : SELF-DESTRUCT

— im·plo·sion noun

— im·plo·sive adjective

im·plore verb im·plored; im·plor·ing : to call upon in supplication : BESEECH, ENTREAT

Synonyms

appeal,