in a colourless manner; without colour.

In a tame manner, in any of the senses of tame, adj.; e.g. like a tame animal; submissively, tractably, quietly, passively; without resistance…

In a dull or spiritless manner; without zest; insipidly.

In an insipid manner; tastelessly; dully; †senselessly, foolishly.

In a vapid manner.

Colourlessly; in a monochrome or monochromatic way. Also in extended use.

In a way that presents no outstanding, individual, or unusual features; unremarkably or impersonally.