3. Imperative; urgent; compelling. Imperious need, which can not be withstood. Dryden.

Syn. — Dictatorial; haughty; domineering; overbearing; lordly; tyrannical; despotic; arrogant; imperative; authoritative; commanding; pressing. — Imperious, Lordly, Domineering. One who is imperious exercises his authority in a manner highly offensive for its spirit and tone; one who is lordly assumes a lofty air in order to display his importance; one who is domineering gives orders in a way to make other feel their inferiority.

IMPERIOUSLY
Im*pe"ri*ous*ly, adv.

Defn: In an imperious manner.

IMPERIOUSNESS
Im*pe"ri*ous*ness, n.

Defn: The quality or state of being imperious; arrogance;
haughtiness.
Imperiousness and severity is but an ill way of treating men who have
reason of their own to guide them. Locke.

IMPERISHABILITY
Im*per`ish*a*bil"i*ty, n.

Defn: The quality of being imperishable: indstructibility. "The imperishability of the universe." Milman.

IMPERISHABLE Im*per"ish*a*ble, a. Etym: [Pref. im- not + perishable: cf. F. impérissable.]

Defn: Not perisha ble; not subject to decay; indestructible;
enduringpermanently; as, an imperishable monument; imperishable
renown.
— Im*per"ish*a*ble*ness, n.
— Im*per"ish*a*bly, adv.