IPA: /ˈbɪtɪli/
KK: /ˈbɪtɪli/
In a manner that is small or fragmented; in bits.
She arranged the decorations bittily, using small pieces of fabric.
The word 'bittily' is formed from 'bitter' (from Old English 'bitter', meaning having a sharp taste or smell) and the suffix '-ly' (meaning in a manner of). Thus, 'bittily' means in a manner that is bitter or with bitterness.
Think of the word 'bitter' to remember that 'bittily' describes something done in a bitter manner.