| obsequious | (adjective) attempting to win favor from influential people by flattery | Synonyms: bootlicking, fawning, sycophantic, toadyish |
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| (adjective) attentive in an ingratiating or servile manner | - |
| observable | (adjective) capable of being seen or noticed | Synonyms: discernible, evident |
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| observant | (adjective) paying close attention especially to details | - |
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| (adjective) (of individuals) adhering strictly to laws and rules and customs | Synonyms: law-abiding |
| (adjective) quick to notice; showing quick and keen perception | Synonyms: observing |
| observational | (adjective) relying on observation or experiment | Synonyms: data-based, experimental |
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| observed | (adjective) discovered or determined by scientific observation | Synonyms: ascertained, discovered |
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| observing | (adjective) quick to notice; showing quick and keen perception | Synonyms: observant |
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| obsessed | (adjective) having or showing excessive or compulsive concern with something | Synonyms: haunted, preoccupied, taken up |
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| (adjective) influenced or controlled by a powerful force such as a strong emotion | Synonyms: possessed |
| obsessional | (adjective) characterized by or constituting an obsession | Synonyms: obsessive |
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| obsessive | (adjective) characterized by or constituting an obsession | Synonyms: obsessional |
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