The adverb 'tenuously' is built upon the adjective 'tenuous', which originates from the Latin tenuis, meaning thin, fine, or slight. This Latin root itself can be traced back to the Proto-Indo-European root ten-, meaning to stretch, a concept intimately linked with the idea of something becoming thin or fine when drawn out. Over time, the physical sense of thinness evolved metaphorically to describe things that are weak, insubstantial, or lacking a firm foundation. The addition of the adverbial suffix '-ly' transforms this descriptive quality into a modifier for actions or states, precisely capturing the manner in which a connection, argument, or grasp is held only slightly and without strength.

Structure: tenu (thin) + ous (adjective suffix) + ly (adverb suffix) - tenu: From Latin tenuis, meaning thin, fine, slight. - ous: A suffix forming adjectives, from Latin -osus, meaning full of, characterized by. - ly: A suffix forming adverbs from adjectives, from Old English -līce.