Adjective

(en adjective)

Holding tenaciously to an opinion or purpose.

* 1884', , "The Path of Duty" in ''The English Illustrated Magazine'' ' 2 (15): 240–256.

*:He would really have to make up his mind to care for his wife or not to care for her. What would Lady Vandeleur say to one alternative, and what would little Joscelind say to the other? That is what it was to have a pertinacious father and to be an accommodating son.

Stubbornly resolute or tenacious.

Adjective

(en adjective)

Unchanged through time or space; permanent.

Consistently recurring over time; persistent.

* {{quote-magazine, date=2013-11-16, volume=409, issue=8862, magazine=(The Economist), author=Schumpeter

, title= The mindfulness business , passage=The constant pinging of electronic devices is driving many people to the end of their tether. Electronic devices not only overload the senses and invade leisure time. They feed on themselves: the more people tweet the more they are rewarded with followers and retweets.}}

Steady in purpose, action, feeling, etc.

* Sir (Philip Sidney) (1554-1586)

Both loving one fair maid, they yet remained constant friends.

* (William Shakespeare) (1564-1616)

I am constant to my purposes.

* (John Dryden) (1631-1700)

His gifts, his constant courtship, nothing gained.

Firm; solid; not fluid.

* (Robert Boyle) (1627-1691)

Ifyou mix them, you may turn these two fluid liquors into a constant body.

(obsolete) Consistent; logical.

* Shakespeare, Twelfth Night IV.ii

I am no more mad than you are: make the trial of it with any constant question.