irrational

irrationnel, illogique

Qui ne repose pas sur un raisonnement clair ou des raisons valables.

En anglais simple : Not based on clear thinking or good reasons.

• I have an irrational fear of birds.
• His anger made him behave in irrational ways.
• Buying another car would be completely irrational.

Synonymes : unreasonable, illogical, senseless

Contraires : rational, logical

Expressions courantes : irrational fear, irrational behaviour, irrational decision

irrationnel

Se dit d’un nombre qui ne peut pas s’écrire comme un entier divisé par un autre.

En anglais simple : A number that cannot be written as one whole number divided by another.

• Pi is an irrational number.
• The square root of two is irrational.
• An irrational number has a decimal expansion that never ends or repeats.

Contraires : rational

Expressions courantes : irrational number, irrational root, irrational value