The spelling of the word "slightiest" can be broken down phonetically as /ˈslaɪ.ti.ɪst/. The first syllable 'slai' sounds like 'sly', the second syllable 'ti' sounds like 'tee', and the ending 'est' sounds like 'ist'. The word is the superlative form of 'slight' and means 'least significant or smallest in amount or degree.' While the double 'i' in the middle of the word may seem unusual, it helps to maintain the correct pronunciation of the ending '-est'.
The word "slightiest" is a derivative of the adjective "slight" with the suffix "-est" added.
The adjective "slight" originally comes from the Middle English word "sliht" which meant "smooth, level, or sleek". It can be traced back to the Old English word "sliht" which carried similar meanings.
Over time, the meaning of "slight" evolved and took on additional connotations such as "small in degree or extent" or "lacking weight or substance". The suffix "-est" is a superlative suffix used to form the superlative degree of adjectives, indicating "the most" or "the least" of a particular quality.
By combining the adjective "slight" with the suffix "-est", the word "slightiest" is formed, indicating "the least substantial" or "the weakest" in comparison to other similar qualities.