not capable of being matched in quality, value, or degree with something else

incomparable
(of two or more things) not able to exist or work together harmoniously due to fundamental differences or contradictions

incompatible
not suitable or effective in satisfying the needs of a particular intended function or objective

incompétent
highly challenging for someone to understand, such as a concept, language, or situation

incompréhensible
(of a substance) maintaining its volume or density even under external forces

incompressible, irreducible
having an unpleasant and sharp smell or taste, especially causing a burning sensation

âcre
beyond doubt or questioning, often due to its obviousness or undeniable nature

indubitable, incontestable
to formally put someone in a position or job, especially with an official ceremony

initier, intégrer, introniser
a person who is formally accepted into a particular group, society, or organization

conscrit
the state of being threatened by or exposed to a significant negative occurrence

péril, danger
full of danger or risk, often threatening safety or well-being

périlleux, dangereux, risqué
the quality or state of being risky or dangerous

péril, situation délicate, situation précaire
to say bad and untrue things about someone, typically to damage their reputation

calomnier, diffamer, dénigrer
to fake illness in order to skip working or doing one's duties

faire semblant d'être malade, feindre d'être malade
