characterized by undue haste and lack of thought or deliberation; "a hotheaded decision"; "liable to such impulsive acts as hugging strangers"; "an impetuous display of spending and gambling"; "madcap escapades"; (`brainish' is archaic)
lacking physical depth; having little spatial extension downward or inward from an outer surface or backward or outward from a center; "shallow water"; "a shallow dish"; "a shallow cut"; "a shallow closet"; "established a shallow beachhead"; "hit the ball to shallow left field"
not deep or strong; not affecting one deeply; "shallow breathing"; "a night of shallow fretful sleep"; "in a shallow trance"
lacking depth of intellect or knowledge; concerned only with what is obvious; "shallow people"; "his arguments seemed shallow and tedious"
friendly and open and willing to talk; "wine made the guest expansive"
marked by exaggerated feelings of euphoria and delusions of grandeur
able or tending to expand or characterized by expansion; "Expansive materials"; "the expansive force of fire"
of behavior that is impressive and ambitious in scale or scope; "an expansive lifestyle"; "in the grand manner"; "collecting on a grand scale"; "heroic undertakings"