Synonym: attitude, conception, explanation, hypothesis, idea, impression, inference, judgment, opinion, speculation, supposition, thought, view. Antonym: practice. Similar words: theoretical, more or less, theology, the other day, in the open, theological, story, history. Meaning: ['θɪːrɪ /'θɪərɪ] 
n. 1. a well-substantiated explanation of some aspect of the natural world; an organized system of accepted knowledge that applies in a variety of circumstances to explain a specific set of phenomena 2. a tentative theory about the natural world; a concept that is not yet verified but that if true would explain certain facts or phenomena 3. a belief that can guide behavior.
n. 1. a well-substantiated explanation of some aspect of the natural world; an organized system of accepted knowledge that applies in a variety of circumstances to explain a specific set of phenomena 2. a tentative theory about the natural world; a concept that is not yet verified but that if true would explain certain facts or phenomena 3. a belief that can guide behavior. 
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61. The theory bears little relevance to practice.
62. The theory does not apply universally.
63. The latest evidence disproves the theory.
64. The theory is full of holes .
65. This theory is a negation of all traditional beliefs.
66. His theory is deficient in several respects.
67. The results support our original theory.
68. The theory of relativity originates with Albert Einstein.
69. I don't think this theory is testable.
70. This theory is at variance with the known facts.
71. What are you basing this theory on?
72. And that's where the theory falls down.
73. Her theory has been shaken by this new evidence.
74. This theory can only be expressed in mathematical language.
75. His book explains the theory for the lay public.
76. He can document his theory with facts.
77. In theory[sentencedict.com], these machines should last for ten years.
78. He passed off this theory as his own.
79. This all goes to prove my theory.
80. Einstein's theory of relativity is very abstruse.
81. Her theory was quoted without acknowledgement.
82. The old theory has been falsified by new evidence.
83. Let's put his theory to the proof.
84. At the moment it is only a theory.
85. Do you know who originated the theory of quantum?
86. There are several difficulties with this theory.
87. He needs to fine down his theory a bit.
88. The optic theory originated with Einstein.
89. This theory fell into disrepute in the fifties.
90. His latest theory has been shot down in flames.
More similar words: theoretical, more or less, theology, the other day, in the open, theological, story, history, factory, category, territory, inventory, in memory of, from memory, laboratory, regulatory, conciliatory.