Indistinct (adjective)

1. Not clearly seen, heard or understood.
2. Not sharply defined or clear in outline.

Origin:

Late middle english (in the sense "not distinct, not clear"): from latin indistinctus, from in- "not" + distinctus "distinct".

Examples:

1. The image was indistinct, making it difficult to make out any details.
2. The sound of the music was indistinct, making it hard to hear the lyrics.
3. She had an indistinct memory of the event.
4. The outline of the object was indistinct and hard to discern.
5. The handwriting was indistinct and difficult to read.