the word 'weirdly' is formed by adding the common germanic adverbial suffix '-ly' to the adjective 'weird'. the adjective 'weird' itself has a fascinating journey, originating from the old english noun 'wyrd', meaning 'fate' or 'destiny', related to the verb 'weorthan' (to become). this concept was personified in the three 'weird sisters', or fates, who controlled destiny in norse and anglo-saxon mythology. through shakespeare's depiction of the prophetic and supernatural 'weird sisters' in macbeth, the word's association with the uncanny and unnatural grew, eventually solidifying into its modern meaning of 'strange' or 'bizarre'. thus, 'weirdly' carries the etymological sense of acting in a manner befitting the mysterious and unpredictable forces of fate.

Structure: weird (strange) + ly (adverb suffix) - weird: from old english 'wyrd' (fate, destiny), of germanic origin. functions as the core adjective meaning 'strange'. - ly: from old english '-līc', an adverbial suffix. functions to form an adverb from an adjective.