Modifying an agent noun or equivalent: in the habit of performing the specified action often or intensively; (esp. with reference to ownership of…

no small: great, considerable, marked; much, a good deal of. Cf. no, adj. 3b.

That is what is specified to a great degree. Obsolete.

of persons in relation to actions or qualities.

Chiefly attributive. Esp. of time or a period of time: that has long since past; in the distant past.

Vividly perceptible, marked, definite. Of a person: being what is indicated to a high degree.