たりとも～ない
Even one / Even a single ~ (absolute minimum is not allowed or not possible) Used to emphasize that not even the smallest amount, number, or unit is acceptable.
N1
Meaning
Even one / Even a single ~ (absolute minimum is not allowed or not possible) Used to emphasize that not even the smallest amount, number, or unit is acceptable.
Formation
Noun (minimum unit / quantity) + たりとも + Verb (negative)
Explanation
たりとも～ない is a strong, formal emphasis pattern used to express absolute negation.
The core idea is:
“Even one unit is not allowed / does not happen.”
Key nuance:
Focuses on the minimum possible amount
Implies:
strict prohibition
zero tolerance
firm determination
Much stronger than:
も
さえ
すら
Tone is:
authoritative
resolute
uncompromising
Common in:
rules and regulations
official statements
warnings
JLPT N1 reading passages
This grammar leaves no room for exception