with a clear head

Related
  • soberFree from intoxication
  • lucidMentally sharp and comprehensible
  • focusedDirecting attention narrowly
  • sharpFine-edged, or astute
  • alertWarning or watchfulness

clearheaded · rational · calm · composed · centered · mindful · awake · present · grounded · steady · collected · balanced · serene · thinking · decisive · aware · unclouded · refreshed

Opposites
mental clarity

with a clear headin a fog

Mentally unclear, disoriented

in a daze · befuddled · confused · disoriented · muddleheaded

sobriety

with a clear headdrunk

Impaired by alcohol

intoxicated · under the influence · inebriated · wasted · hammered

emotional state

with a clear headlosing one's head

Becoming wildly irrational

in a panic · beside oneself · hysterical · in a frenzy · distraught

Familiarity
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