Describes acting with wild, single-minded energy, often disregarding risk or consequences. Can be positive (passionate, all-out) or negative (foolhardy).
He worked frantically and finally succeeded.
Reckless driving is dangerous.
無謀 emphasizes lack of planning or thoughtlessness, while がむしゃら focuses on wild, energetic action without regard for risk.
必死 means 'desperate' or 'frantic' with a nuance of life-or-death effort, whereas がむしゃら implies reckless abandon more than desperation.
Usually written in kana; the kanji form 我武者羅 is ateji and rare.
Katakana form is search-only; not a common practical spelling.
Ateji (phonetic) spelling; rarely used in modern writing.
The origin is uncertain. The kanji 我武者羅 is ateji, and the word is likely a native Japanese mimetic or sound-symbolic formation.