off the deep end
Lost all composure
Off the deep end describes losing control emotionally or mentally, as if plunging into water over one's head.
To go off the deep end is to become irrationally angry, obsessed, or unhinged: She went off the deep end when she found out he'd been lying.
The phrase suggests sudden, dramatic loss of composure or judgment.
Mentally or emotionally unstable
- snappedBroke with sudden force
- lost itSuddenly gave way emotionally
- crackedHaving surface fractures
- meltdownCatastrophic loss of control
breakdown · freakout · outburst · hysteria · berserk · frenzied · hysterical · deranged
unhinged
Mentally or emotionally unstable
meltdown · breakdown · freakout · outburst · hysteria · berserk · frenzied · hysterical · deranged · unstable
reckless
Carelessly ignoring danger
- hastyExcessively quick, ill-considered
- brashOffensively self-assertive
- rashHeedless or skin irritation
impetuous · snap decision · drastic · desperate · plunge · leap · precipice · brink · no turning back · point of no return
fanatical
Extremely and uncritically devoted
hardcore · fixated · consumed · manic · compulsive · single-minded · possessed · fervent · intense · all-in
- meltdownsnuclear meltdown, reactor meltdown, meltdown, freak out, losing it
- insanityinsane, crazy, mad, lunatic, insanity
off the deep endcalm and collected
Emotionally steady, unflustered
cool as a cucumber · level-headed · even-keeled · composed · unflappable
off the deep endsane
Mentally healthy, clearheaded
in one's right mind · rational · lucid · of sound mind · sensible
deep, deepen, deeply, deepness, deeper, deepest, ending, endless