(archaic) An observation (remark, comment or judgement).

Attended by, or making, a loud and tumultuous noise; boisterous. / Stubbornly defiant; disobedient; resistant to authority or control, whether in a noisy manner or not.

Stubbornly adhering to an opinion, purpose, or course, usually with implied unreasonableness; persistent. / (of inanimate things) Not easily subdued or removed.

To block or fill (a passage) with obstacles or an obstacle. See synonyms at block. / To impede, retard, or interfere with; hinder. / To get in the way of so as to hide from sight.

Dark, faint or indistinct. / Hidden, out of sight or inconspicuous. / Difficult to understand. / Not well-known. / Unknown or uncertain; unclear.

(transitive) To render obscure; to darken; to make dim; to keep in the dark; to hide; to make less visible, intelligible, legible, glorious, beautiful, or illustrious.

In the process of becoming obsolete, but not obsolete yet.

(uncountable) The state of being obsolete—no longer in use; gone into disuse; disused or neglected. / (countable) The process of becoming obsolete, outmoded or out of date.

Able to be observed. / Deserving to be observed; worth regarding; remarkable.

(physics) Any physical property that can be observed and measured directly and not derived from other properties