Inside the veins.

(medicine) A dose of medicine administered from a drip, down through a hollow needle inserted into a patient's vein.

(grammar, of a verb) Not transitive: not having, or not taking, a direct object. / (rare) Not transitive or passing further; kept; detained.

(grammar) An intransitive verb.

Unwilling to compromise or moderate a position; unreasonable

A person who is intransigent.

Located or taking place inside the uterus.

In an intractable manner; uncontrollably; unmanageably.

A contraceptive device consisting of a spiral or similar shape of plastic or metal inserted through the vagina into the uterus in order to prevent the implantation of a fertilized egg.

plural of intransitive verb