Invisibly.

In an invisible manner; so that it cannot be seen; imperceptibly.

Imperceptibly.

Invisibly.

invisibly.

(un-, prefix1 affix 5: cf. undiscernable, adj.)

In an imperceptible manner or to an imperceptible degree; so subtly, gradually, or minutely as not to be perceptible to the mind or senses.

in an imperceptible manner or to an imperceptible degree; imperceptibly.

in an indiscernible manner, imperceptibly.

= indiscernibly adv. at indiscernible, adj. n.derivatives.

†invisibly (obsolete); so as not to be readily perceived.

invisibly.

without, beyond, or beneath appreciation; imperceptibly.