Generally treated as non-gradable; comparative and superlative forms are rarely accepted.
The two companies had parallel strategies for expanding their market share.
Les deux entreprises avaient des stratégies parallèles pour accroître leur part de marché.
The two roads were parallel, running alongside each other for miles without ever meeting.
Les deux routes étaient parallèles, longeant l'une l'autre pendant des kilomètres sans jamais se rejoindre.