Words to Describe cogitation

How cogitation often is described ("________ cogitation")

• mortal
• sleepless
• evident
• swift
• private
• deepest
• present
• solemn
• vague
• laborious
• earnest
• much
• apparent
• deep
• careful
• dim
• painful
• perplexed
• philosophical
• slow
• anxious
• little
• deliberate
• dispiriting
• sufficient
• continual
• internal
• nervous
• serious
• fruitless
• grave
• quiet
• melancholy
• cerebral
• logical
• better
• constant
• due
• further
• bitter
• inward
• lengthy
• fearful
• mere
• profoundest
• endless
• worldly
• considerable
• troubled
• lonely
• intense
• abstract
• long
• intellectual
• incessant
• uninterrupted
• mental
• gloomy
• solitary
• mature
• everyday
• unsympathetic
• dreamy
• profound
• continuous
• self
• pure
• metaphysical
• silent
• protracted
• conscious
• rational
• preliminary
• brief
• prolonged
• theological