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Adverb: impermissibly
  1. Not permissibly
    "the radon level in the basement was impermissibly high"

See also: impermissible

Antonym: permissibly

Nearest

imperishingness
imperium
impermanence
impermanency
impermanent
impermeability
impermeable
impermeableness
impermissibility
impermissible
impermissibly
impersonal
impersonality
impersonally
impersonate
impersonation
impersonator
impertinence
impertinent
impertinently
imperturbability