Deep-grounded

[…] as they have no root, no deep-grounded knowledge, no well-fixt principles, no regular light, but hasty gleams only; […]

[…] for it is utterly impossible to sever by outward interference the threads of history, to force back again by some diplomatic mediation or other, deep-grounded antagonisms taken in the midst of their development.

[…] the general policy has been guided by a deep-grounded recognition of the principles of justice and right on the part of both people; […]

Instead of discipline and preparation for the task of the future, instead of deep-grounded experience in coöperative effort, we shall get, if strike-breakers and blind legislators and brutal policemen and prejudiced judges and visionless employers prevail, despair and hate and servile rebellions.

[…] escaping largely the conventional and typical manners and humours, he gave the world two comedies of unsurpassed freshness, deriving their interest from no passing fashion of the day but from their deepgrounded perception of human nature, their liveliness from the ingenious inventions of a really creative imagination, and their charm from the playfulness of a buoyant, happy spirit at large in a new, untrodden field.