Definition of not be oneself in English:

not be oneself

phrase

  • Not feel in one's usual physical or mental state.

    ‘I'm not myself this morning’
    • ‘He's just not himself today.’
    • ‘With his head down, he was positively not himself this morning.’
    • ‘For that matter, you were not yourself yesterday, and you will not be tomorrow.’
    • ‘I'm not really myself right now.’
    • ‘Funny things were happening to me and I was simply not myself.’
    pale, pasty-faced, pasty, wan, drained, washed out, drawn, pallid, colourless, anaemic, bloodless, whey-faced, ashen, ashen-faced, ashy, grey, pinched, sickly, sallow, as white as a ghost, as white as a sheet, deathly pale, cadaverous, corpse-like, ill-looking, sickly-looking
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