1. (adjective) not based on fact; unreal

• fanciful
• imaginary

2. (adjective) not based on fact or investigation

• speculative

3. (adjective) indulging in or influenced by fancy

• fanciful

4. (adjective) being of the nature of a notion or concept

• conceptional
• ideational

1. (adjective) not based on fact; unreal

• unreal

2. (adjective) not based on fact or investigation

• theoretic
• theoretical

3. (adjective) indulging in or influenced by fancy

• creative
• originative

4. (adjective) being of the nature of a notion or concept

• abstract

1. (adjective) not based on fact or investigation

• conjecture
• hypothecate
• hypothesise
• hypothesize
• speculate
• suppose
• theorise
• theorize
• speculate
• speculativeness

2. (adjective) being of the nature of a notion or concept

• concept
• conception
• construct
• ideation
• notion