Observant, perceptive.

Observing or observant.

Attentive; observant. Also occasionally with †to. Now rare.

Observant, watchful, attentive; contemplative.

Careful as to the standard of excellence; difficult to satisfy; particular; nice, fastidious. Obsolete. esp. in food, clothing, matters of taste.

Attentive, perceptive; quick to notice or perceive. Frequently with of, †on.

That observes or takes notice; quick to notice, observant; engaged in scientific observation. Formerly: spec. †careful (obsolete).

Of, relating to, consisting of, or based on observation; given to observation, observant, attentive, heedful.

That has the capacity for animadversion; spec. (in early use) perceptive, percipient, (in later use) critical, hostile.

Quick to suspect or take note; shrewd, sharp, suspicious. Obsolete.

Observant; taking notice of. Obsolete.