Synonyms of theoretical

theoretical

adjective

ˌthē-ə-ˈre-ti-kəl 

variants also theoretic

1

as in hypothetical

existing only as an assumption or speculation

the merits of the new testing procedures are purely theoretical, since no one has ever used them before

Synonyms & Similar Words

• hypothetical
• speculative
• conjectural
• academic
• conceptual
• abstract
• suppositional
• metaphysical
• intellectual
• proposed
• alleged
• assumed
• presumed
• debatable
• unproven
• unproved
• supposed
• moot
• untested
• presupposed
• nonclinical
• nonempirical
• nonpractical

Antonyms & Near Antonyms

• actual
• real
• practical
• factual
• clinical
• concrete
• definite
• distinct
• defined
• empirical
• demonstrated
• confirmed
• observational
• established
• tested
• proven
• validated
• substantiated
• attested
• verified
• authenticated
• time-tested
• nontheoretical
• nonspeculative

2

as in metaphysical

dealing with or expressing a quality or idea

the theoretical musings in his new book are less engaging than the anecdote-driven arguments of his previous works

Synonyms & Similar Words

• metaphysical
• conceptual
• abstract
• speculative
• mental
• intellectual
• ideal
• spiritual
• hypothetical
• notional
• ideational
• cosmic
• transcendental
• invisible
• conjectural
• immaterial
• romantic
• intangible
• utopian
• impractical
• imperceptible
• nonphysical
• ethereal
• nonmaterial
• incorporeal
• transcendent
• unreal
• insubstantial
• visionary
• unsubstantial
• impalpable
• insensible

Antonyms & Near Antonyms

• concrete
• physical
• substantial
• tangible
• material
• actual
• appreciable
• observable
• visible
• sensible
• real
• discernible
• noticeable
• perceptible
• definite
• detectable
• distinct
• nonabstract
• factual
• palpable
• defined

Example Sentences

Recent Examples of theoretical

Such scenarios may become more common as militaries continue to deploy a once-theoretical technology — AI-assisted or autonomous weapons, capable of making both targeting and launch decisions on their own — on real battlefields around the globe. — Kylie Jones, Vox, 25 Oct. 2026

Michael Flynn was 28 and working towards earning his PHD in theoretical physics when the 30-foot-long dead tree limb fell over 27 feet onto him, fracturing his skull and changing his life forever. — Madisen Keavy, CBS News, 16 Oct. 2026

For customers, the relevant comparison is not a robot’s theoretical hourly cost versus a worker’s wage. — Navin Chaddha, Fortune, 16 Oct. 2026

The Quaternary Interpretation of Quantum Dynamics (QIQD) provides the theoretical foundation for this view. — Pravir Malik, Forbes.com, 16 Oct. 2026