very much; very many; more and more
Adverb used to emphasize a large quantity, frequency, or degree. Often appears in formal or written language. Can also express an increasing trend.
I have caused you a great deal of trouble.
There are many contradictions in his explanation.
There is much debate on this issue.
Lately, I have come across it more and more.
Many typos can be seen throughout this report.
There are many points we need to reflect on regarding this project.
数多く is a formal written word for 'numerous' focused on countable items, while 多々 more often modifies verbs like ある/見られる to stress frequency.
少々 means 'a little' in the same formal register, contrasting with 多々's 'very much/many'.
多々 describes many instances or occurrences of something, while 多大 describes the great magnitude or extent of a single thing, as in 多大な迷惑.
Standard kanji spelling; common in formal and written contexts.
Variant kanji spelling; less common than 多々.
Reduplication of 多 (た, 'many'), forming an adverb meaning 'very many' or 'much'. The kanji 多々 is a straightforward representation of this reduplication.