Without a basis in reason or fact; SYN. groundless, idle, unfounded, unwarranted.

1. Having no cause or apparent cause; SYN. fortuitous, uncaused.
2. Having no justifying cause or reason; SYN. reasonless.

ETYM AS. grundleás bottomless.
Without ground or foundation; wanting cause or reason for support; not authorized; false.

Occurring without motivation or provocation; SYN. unprovoked, wanton.

1. Not founded; not built or established.
2. Having no foundation; baseless; vain; idle

Without cause