constantly

UK: /ˈkɒnstəntli/

WordReference Random House Learner's Dictionary of American English © 2026

con•stant /ˈkɑnstənt/   adj. 

1. not changing;
   staying the same:
   Driving at a constant speed saves gas.
2. continuing without pause;
   not stopping:
   constant noise.
3. faithful, as in love, devotion, or loyalty:
   a constant friend during all the turmoil.

n. [countable]

4. something that does not change or vary:
   The speed of light was postulated as a constant.

con•stant•ly, adv. See -stan-.

WordReference Random House Unabridged Dictionary of American English © 2026

con•stant  (kon′stənt), adj. 

1. not changing or varying;
   uniform;
   regular;
   invariable:
   All conditions during the three experiments were constant.
2. continuing without pause or letup;
   unceasing:
   constant noise.
3. regularly recurrent;
   continual;
   persistent:
   He found it impossible to work with constant interruption.
4. faithful;
   unswerving in love, devotion, etc.:
   a constant lover.
5. steadfast;
   firm in mind or purpose;
   resolute.
6. [Obs.] certain;
   confident.

n. 

7. something that does not or cannot change or vary.
8. Physics a number expressing a property, quantity, or relation that remains unchanged under specified conditions.
9. Mathematics a quantity assumed to be unchanged throughout a given discussion.

• Latin constant- (stem of constāns, present participle of constāre to stand firm), equivalent. to con- con- + stā- stand + -nt- present participle suffix
• Middle English 1350–1400

con′stant•ly, adv. 
Synonyms

• 1. unchanging, immutable, permanent.
• 2. perpetual, unremitting, uninterrupted.
• 3. incessant, ceaseless.
• 4. loyal, staunch, true. See faithful. 
• 5. steady, unwavering, unswerving.

Antonyms

• 1. changeable.
• 2. fitful.
• 3. sporadic.
• 4. unreliable.
• 5. wavering.

Con•stant  (kôn stän′), n. 

Paul Hen•ri Ben•ja•min Bal•luat  (pôl än rē′ ban zha man′ ba lwa′). See Estournelles de Constant, Paul.  Jean Jo•seph Ben•ja•min  (zhän zhô zef′ ban zha man′), 1845–1902, French painter.